Quantitative Aptitude - Arithmetic Ability Questions

If 192 pens cost is Rs.10, how many pens can be bought for Rs.5?

Of the 3 numbers whose average is 40, the first is 1/3 rd the sum of other 2. What is the first number?

A pipe, working at full speed, can fill an empty cistern in 1 hour. However, during the first hour it worked at one-twelfth of its capacity, during the second hour at one-ninth of its capacity, during the third hour at one-sixth of its usual capacity and during the fifth hour it was only one -third as efficient as it was supposed to be. A second pipe also displayed similar performance, but if it worked at full speed would have filled the empty cistern in 2 hours. Together with a drain pipe that drained water out of the tank at a constant rate, the empty cistern could be filled in 5 hours, all the three pipes working concurrently. How many hours will it take the drain pipe to empty the filled cistern if no other pipe was functioning during the time?

If x -­ y = ­7 and x + y = 13, then x2 - y2 is

What is the value of xy if x - y = 3 and x2+y2=15?

If 2x+ 4(x - 3) < -2 - x < 2x - 1, then find the value of x.

Find the odd word/letters/number from the given alternatives.

If 90% of A = 30% of B and B = x% of A, find x.