kittu ji dnt wry....answer for this ques is 16 (1/2) days.. look A=10days B=20 days C=40days....we will find lcm of of them...which will be 40...now we will suppose total work is of 40 nits... A will do=4units works in 1 day B will do=2 units C=1unit ABC ABC ABC ABC...this will be cycle every cycle will do 7units of works in 3 days...hence we will be needing 5 such cycle=35 units of work still 5 units of work is left... that will be done by A and B...A will complete its work...till then 39 units of work will be done....in 16 days... now B can do 2 units of work...but only 1 unit is left hence answer will be 16 1/2....days...i hope i am clear
thanks a ton guddaji..i understood all the steps except hence we will be needing 5 such cycle=35 units of work y we need 5 such cycle and hw u calculated that 16???sorry for troubling u..:-(
thanks a ton guddaji..i understood all the steps except hence we will be needing 5 such cycle=35 units of work y we need 5 such cycle???sorry for troubling u..:-(
arey dnt wry...in 1 cycle of ABC 7 units of work will be done...hence....in 5 cycles of ABC=35 units of work will be done.... Work of (ABC)=WORK OF A+WORK OF B+WORK OF C =4units+2units+1units.... i hope now i am clear.... ps.-baki k bhi solve kar deta..but abhi kahi jana hai...family k saath...baad mein aa kar solve karta hu....
arey dnt wry...in 1 cycle of ABC 7 units of work will be done...hence....in 5 cycles of ABC=35 units of work will be done.... Work of (ABC)=WORK OF A+WORK OF B+WORK OF C =4units+2units+1units.... i hope now i am clear.... ps.-baki k bhi solve kar deta..but abhi kahi jana hai...family k saath...baad mein aa kar solve karta hu....
There are three Taps A, B and C in a tank. They can fill the tank in 10 hrs, 20 hrs and 25 hrs respectively. At first, all of them are opened simultaneously.then after 2 hours,tap C is closed and A and B are kept running.After the 4th hour,tap B is also closed.the remaining work is done by Tap A alone.Find the percentage of the work done by tap A by itself. pls explain in details with steps
There are three Taps A, B and C in a tank. They can fill the tank in 10 hrs, 20 hrs and 25 hrs respectively. At first, all of them are opened simultaneously.then after 2 hours,tap C is closed and A and B are kept running.After the 4th hour,tap B is also closed.the remaining work is done by Tap A alone.Find the percentage of the work done by tap A by itself. pls explain in details with steps
Ans : Work done by all of them = 1/a + 1/b + 1/c = 1/10 + 1/20 + 1/25 = 19/100. So in two hours hours they complete 38/100 part of work. Work left = 1-38/100 = 62/100. Now C leaves. So work done by A and B = 1/a + 1/b = 1/10 + 1/20 = 3/20 So for two hours they do = 3/10 part of the work. Work left = 62/100 - 3/10 = 32/100. Now B leaves. So remaining part of work done by A in 31/100 x 10 = 3.2 hours. So total amount of work done by A = (2+2+3.2)x 1/10 = 0.72 part of the work ie 72 % of the work.
Pls Explain: 1) From a bag containing 4 white and 5 black balls a man draws 3 at random. what are the odds against these being selected? (pls explain what they mean by odds against these being selected) a) 5/37 b) 37/5 c)11/13 d)13/37
2) In a horse race there were 18 horses numbered 1-18. The probability that horse 1 would win is 1/6, that 2 would win is 1/10 and that 3 would win is 1/8. Assuming that tie is not possible, find the chance that one of the three will win. a)47/120 b)119/120 c)11/129 d)15/216
3) A husband and wife appear in an interview for two vacancies for the same post. The probability of husband's selection is 1/7 and of wife is 1/5. what is the probability that both of them will be selected? a)1/35 b)2/35 c)3/35 d)1/7
4)Amit throws three dice in a special game of ludo. If it is known that he needs 15 or higher in this throw to win then find the chance of his winning the game a)5/54 b)17/216 c)13/216 d)15/216
i didnt get n as 21 not 6 i used the same AP method..could u pls elaborate.. thanks in advance
See.. it is like 10*(1+2+3+4+....+n) = 210 => 1 + 2 + 3 + 4 + ..... + n = 21 => n = 6 as sum of first 6 numbers is 21
=> 10*(1+2+3+4+5+6) = 21 => Number of people used = 10 + 20 + 30 + 40 + 50 + 60 => NUmber of days needed = 60 as at the end of 60th day; there will be 60 people working
If still not clear, PM me your where you are confused in details.
Rishikant, during his journey, travels for 20 minutes at a speed of 30 km/h, another 30 minutes at a speed of 50 km/h, and 1 hour at a speed of 50 km/h and 1hour at the speed of 50km/hr and 1 hour at a speed of 60km/hr.what is the average velocity..pls explain in detail with steps the answer is 51.18
Rishikant, during his journey, travels for 20 minutes at a speed of 30 km/h, another 30 minutes at a speed of 50 km/h, and 1 hour at a speed of 50 km/h and 1hour at the speed of 50km/hr and 1 hour at a speed of 60km/hr.what is the average velocity..pls explain in detail with steps the answer is 51.18
He travels like: 20 mins at 30km/hr => Distance travelled = 10 km 30 mins at 50km/hr => Distance travelled = 25 km 60 mins at 50km/hr => Distance travelled = 50 km 60 mins at 60km/hr => Distance travelled = 60 km
=> Total distance travelled = 145 km and total time taken = 170 min i.e. 17/6 hours => Average speed = 145/(17/6) = 51.176 km/hr
Rishikant, during his journey, travels for 20 minutes at a speed of 30 km/h, another 30 minutes at a speed of 50 km/h, and 1 hour at a speed of 50 km/h and 1hour at the speed of 50km/hr and 1 hour at a speed of 60km/hr.what is the average velocity..pls explain in detail with steps the answer is 51.18
avg velocity is same as avg speed in mathematics...but very different in physics.... so formula for that is total distance/total time taken total distance is=speed*time....change very data into hour..or in same unit hence=30*20/60+50*30/60+50+60 total time will be=20/60+30/60+1+1 put this in above formula and you will get your answer.... i hope i am clear
1)In how many ways can 4 Indians and 4 Nepalese people be seated around a round table so that no two Indians are in adjacent positions? they have given that if we put first 4 indians around the table we can do it in 3! hw is it possible?i calcualted it as 4! factorial way??can anyone pls explain hw it is 3! ways..
2)Two girls and their dates go to the drive-in, and each wants a different flavored ice cream cone. The drive-in has 24 flavors of ice cream. How many combi*nations of flavors may be chosen among the four of them if each one selects one flavor? pls explain with steps thanks in advance
A can built up a structure in 8 days and B can break it in 3 days. A has worked for 4 days and then B joined to work with A for another 2 days only. In how many days will A alone built up the remaining part of the structure?
Weekly incomes of two persons are in the ratio of 7 : 3 and their weekly expenses are in the ratio of 5 : 2. If each of them saves Rs. 300 per week, then the weekly income of the first person is
1)In how many ways can 4 Indians and 4 Nepalese people be seated around a round table so that no two Indians are in adjacent positions? they have given that if we put first 4 indians around the table we can do it in 3! hw is it possible?i calcualted it as 4! factorial way??can anyone pls explain hw it is 3! ways..
2)Two girls and their dates go to the drive-in, and each wants a different flavored ice cream cone. The drive-in has 24 flavors of ice cream. How many combi*nations of flavors may be chosen among the four of them if each one selects one flavor? pls explain with steps thanks in advance
1.it is 3!*4! because when we place four Indians and it is the same when calculated from clockwise and anticlockwise direction so it is (n-1)!..
Weekly incomes of two persons are in the ratio of 7 : 3 and their weekly expenses are in the ratio of 5 : 2. If each of them saves Rs. 300 per week, then the weekly income of the first person is
A can built up a structure in 8 days and B can break it in 3 days. A has worked for 4 days and then B joined to work with A for another 2 days only. In how many days will A alone built up the remaining part of the structure? 12 days 9 days 10 days None of these
my take is none of these... A--->8 days B--->3 days.. let total amount of work be 24 units hence A can do 3 unit of work in 1 day and B can destroy 8units of works in one day.. A worked for 4 days hence 12units of work is done...then B joins him for 2 days which means he will destroy 16 units of work and till them A will have done 18 units of work... so now total work done is only 2 units left over work is 22 units ...which A will do in 7 1/3 days... please correct me if i am wrong somewhere
Vinay fires two bullets from the same place at an interval of 12 minutes but Raju sitting in a train approaching the place hears the second report 11 minutes 30 seconds after the first. What is the approximate speed of train (if sound travels at the speed of 330 metre per second)? pls explain in detail with steps
Vinay fires two bullets from the same place at an interval of 12 minutes but Raju sitting in a train approaching the place hears the second report 11 minutes 30 seconds after the first. What is the approximate speed of train (if sound travels at the speed of 330 metre per second)? pls explain in detail with steps
Let train velocity be v m/s Now assume the train is at rest, so the speed of sound can be taken as 330 + v In 12 mins, the distance between Raju and Vinay changed by 12*60*v metres. Speed of traversing this distance : 330 + v Time of traversing this distance : 30 secs [ If the distance had been same as in previous case, the time taken would have been same. Time has decreased, so the decrease must have been caused due to a decrease in distance ] (12*60*v) / (330 + v) = 30 => v = 330/23 m/s
1)A car travels 1/3 of the distance on a straight road with a velocity of 10 km/hr, next l/3rd with velocity 20 km/hr and the last l/3rd with velocity 60 km/hr. What is the average velocity of the car for the whole journey?
2)A plane left half an hour later than the sheduled time in order to reach its destination 1500 kms away in time,it had to increase its speed by 33.33 percent over the usual speed. Find increased speed
