A tank is fitted with 8 pipes, some of them that fill the tank and others that are waste pipe meant to empty the tank. Each of the pipes that fill the tank can fill it in 8 hours, while each of those that empty the tank can empty it in 6 hours. If all the pipes are kept open when the tank is full, it will take exactly 6 hours for the tank to empty. How many of these are fill pipes?
(1)2 (2)4 (3)6 (4)5
In how many ways can one arrange 5 pairs of shoes in such a way that two shoes of same pair are never together?
0 voters
A 20 litre mixture of milk and water contains milk and water in the ratio 3 : 2. 10 litres of the mixture is removed and replaced with pure milk and the operation is repeated once more. At the end of the two removal and replacement, what is the ratio of milk and water in the resultant mixture?
not sure but i am getting 10! - 5!(2^5) so basically none of these, thing is that how we have to arrange is not clear, is it in single line, or two columns etc.
A group of 5 people are going to meet weekly at the library for 4 weeks. Each week, two people are selected at random to speak. Each person may speak in multiple weeks, but no pair of people will speak together more than once. The probability that there is a person who will never be asked to speak
One bad day, at 7 a.m. I started on my bike at the speed of 36kmph to meet one of my relatives. After I had travelled some distance, my bike went out of order and I had to stop. After resting for 35 minutes, I returned home on foot at a speed of 14 kmph and reached home at 1 p.m. Find the distance from my house at which my bike broke down.
54km
63km
72km
66km
None of these
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54.6 km
A and B can doa piece of work in 12 days. B and C together do it in 15 days. If A is twice as good workman as C, In how much time will B alone can do the work.
1010101...94 digits is a 94 digits number. what will be the remainder obtained when this number is divided by 375? please explain
Ramu has some choclates boxes he wants to sell, he sells them either as full or half boxes. 1st customer buys half a box more than half the number of boxes with ramu. 2nd customer buys half a box more than half the remaining boxes with him. Ramu continues to sell in this manner to 8 other customers. He is left with no boxes to sell after that, How many choc boxes did he have in the beginning.
0 voters
A finishes 6/7th of his work in 2Z hours, B works twice as fast and finishes the remaining work. For how long did B work?
A set of 10 pipes (setX) can fill 70% of a tank in 7 minutes.
Another set of 5 pipes (set Y) can fill 3/8 of a tank in 3 minutes.
A third set of 8 pipes (set Z) can fill 5/10 of a tank in 10 minutes.
1. Total time to fill all 23 pipes.
2. If only half the pipes of set X are closed and only half the pipes of set Y are open , how long will it takes to fill 49% of the tank.
3. If 4 pipes are closed in set Z and all others remain open , how long will it takes to fill the tank.
4. if the tank is half full and set X and set Y are closed , how many minutes will it takes for set Z to empty the tank if alternate taps of set Z are closed.
5. If one pipe is added for set X and set Y and set Z's capacity is increased by 20% on its original value and alll the taps are opened at 2:58 P.M , then at what time does the tank get filled?
A can do as much work in 2 days as B can do in 3 days. and
B can do as much work in 4 days as D can do in 5 day. A piece of work takes 20 days if all work together. how long would B take to do all the work by himself.
2 pipes can fill a cistern in 14 and 16 minutes . the pipes are opened simultaneously and it is found that due to leakage in the bottom of the cistern it takes 32 minutes more for the cistern to be filled up. When cistern is full in whta time will the leak empty it.
HELP wid this guys...
Once upon a time there was a cruel king,he had a beautiful daughter..d princess fell in love wid a common man, when d king found out d romantic chapter he ordered that her lover should b executed..d princess pleaded 4 mercy,ab aaya kahani me twist 😛 the king offered d princess a fair chance to save her lover.. He put 2 bowls infront of her and gave her 100 black n 100 white marbels,he asked her to distribute d 200 marbels in d 2 bowls.. The man would b blindfolded and wud b asked to pick up a marbel,if the marbel z white he can marry d princess n if he picks up d black then he wud b executed..the princess z a beauty wid brains combination..can u tell how she wud distribute d marbels so that d probability of him choosing white is maximised :)
@catahead can someone plz explain its solution
What should be the diameter of a tyre to cover a distance of 660m in 1 minute if it is known that every tyre revolves at a constant speed of 5 revolutions per second?
0 answers 25
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What is the number of ways to get 16 as the sum while throwing a dice five times in a row?
HELP wid this guys...Once upon a time there was a cruel king,he had a beautiful daughter..d princess fell in love wid a common man, when d king found out d romantic chapter he ordered that her lover should b executed..d princess pleaded 4 mercy,ab aaya kahani me twist the king offered d princess a fair chance to save her lover.. He put 2 bowls infront of her and gave her 100 black n 100 white marbels,he asked her to distribute d 200 marbels in d 2 bowls.. The man would b blindfolded and wud b asked to pick up a marbel,if the marbel z white he can marry d princess n if he picks up d black then he wud b executed..the princess z a beauty wid brains combination..can u tell how she wud distribute d marbels so that d probability of him choosing white is maximised :)
ans is 149/199👍
A telecom service provider engages male and female operators for answering 1000 calls per day. A male operator can handle 40 calls per day whereas a female operator can handle 50 calls per day. The male and the female operators get a fixed wage of Rs. 250 and Rs. 300 per day respectively. In addition, a male operator gets Rs. 15 per call he answers and female operator gets Rs. 10 per call she answers. To minimize the total cost, how many male operators should the service provider employ assuming he has to employ more than 7 of the 12 female operators available for the job?
(1) 15 (2) 14 (3) 12 (4) 10
Find the total number of possible outcomes when three fair identical dice are rolled.
A) 156
B) 51
C) 36
D) 56