An aeroplane first flew with the speed of 440 km/h and covered a certain distance. It still had to cover 770 km less than what it had already covered but it flew with the speed of 660 km/h.
The average speed for the entire flight was 550 km/h Fin the total distance covered ?
Let S be the set of all pairs (i, j) where 1 β€ i have one constituent of the pairs in common and βenemiesβ otherwise. For example, if n = 4, then S = {(1, 2), (1, 3), (1, 4), (2, 3), (2, 4), (3, 4)}. Here, (1, 2) and (1, 3) are friends, (1,2) and (2, 3) are also friends, but (1,4) and (2, 3) are enemies.
For general n, how many enemies will each member of 5 have?
For general n, consider any two members of S that are friends. How many other members of S will
be common friends of both these members?
A shopkeeper uses a balance weights of 2 pans in the ration 3/2 respectively. A cetain qty of food weighs 9kg when kept in one pan & 8 kg when kept in other pan. find the actual weight of the food grain.
The ratio of radius and height of a cylinder is 2:3. The ratio of the numerical value of the curved surface area and volume is 1:2. Find the total surface area.
How many arrangements of six 0's, five 1's and four 2's are there in which the first 0 precedes the first 1?
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In the diagram, all the triangles are equilateral. If AB = 16 units, then the total area of all the black triangles isο»Ώ
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a)cube root o f25 ^3 sq. units(b) cube root of 27 sq. units(c) cube root of 3 5sq.units(d) cube root of 37 sq. units
answers given in book by arun sharma is cube root of 37. If anyonw is geeting d as answer, kindly tell me also. thanks π
A straight line is perpendicular to the straight line 2x + 3y = 5 and it passes through the point (1, 1).
Which of the following gives its equation?
a. 2x β 3y = 1
b. 2x + 3y = 2
c. 3x + 2y = 1
d. 3x β 2y = 1
Dont know whats the answer.. share your approach..
A straight line passes through the point (3, 2) and is perpendicular to the straight line x+ y = 3 and
is perpendicular to the straight line x + y = 3. Find its equation.
a. x + y + 1 = 0
b. x β y β 1 = 0
c. x β y + 1 = 0
d. x + y β 1 = 0
Dont know whats the answer.. share your approach..
The vertices of a triangle lie on points (0, 4), (3, 5) and (β1, β1) in the X β Y plane. Which of the
following is correct about this triangle?
a. It is an isosceles right triangle.
b. It is a right triangle.
c. It is an equilateral triangle
d. It is an obtuse triangle.
no. of ways in which 72 can be written as a product of 3 positive integers?..didn't understand method given by pagalguy..
if (a/3) = (b/4) = (c/7), then what is the value of (a+b+c)/c
Four people are running around a circular ground in 432 km race of 2 laps. Initially they all separated by 1/4th of the circumference of ground and their speeds are 10m/s, 20m/s, 30m/s and 40m/s respectively. After every hour they exchange their speeds such that A takes B's speed, B takes D's speed, C takes A's speed and D takes C's speed. Find the time taken by winner to finish the race.
a) 3hrs b) 4hrs 51min c) 4hrs 48 min d) None of these
A starts from point P towards north at a certain time and after sometime B also starts from point P towards North and catches up with A at 12 noon. Had B started an hour later , he would have caught up with A at 4 pm. What is the ratio of speed of A and B????with approach...
A.3:4 b:4:5
Find the total number of zeros at the end of the following number. (1!)(2!)(3!)(4!).........(99!) ?
A shopkeeper sold a two-digit number of toys all priced at a certain value (also a two-digit number when expressed in rupees). By mistake he reversed the digits of both, the number of items sold and the price (in rupees) of that item while entering in the computer. So, the stock left at the end of the day showed 81 items more than it actually was.
Q.1 How many possibilities exist for the actual number of toys sold?
a)1 b)2 c) 3 4) d
Q.2 If the faulty calculations show a total sale of Rs.486, what was he actual selling price (in Rs.) of each toy ?
a) 54 b) 45 c) 63 d) 36
4.4!+5.5!+6.6!..........+19.19!, remainder when divided by 64.
please answer with suitable approach.
I don't know the options.
0 voters
hello guys.. m having trouble in solving algebra problems. any shortcuts of tips for it?
the number of whole number solutions to the equation 5x+8y+11z=100 is?..how to solve this question?..i mean i can solve it by substituting z=11,22 ,33 etc and the solve for 5x+8y=100-11z,then physically counting all the cases..is there any better method.Don't have OA.
how many times does the digit 5 appear in the numbers from 9 to 1000?
please provide solution in comments1) 300
2) 257
3) 256
4) 299 Skip
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P started running around a circular track of length 800 m from the starting point A. When P reached the 600 m mark Q started running around the track from A in the same direction as P. When Q reached the 400 m mark R started from A in the same direction as Q. When R reached the 200 mark S started from A in the same direction as R. If when P reached A for the first time Q, R, and S also reached for the first time. What is the ratio of the speeds of P, Q, R and S