Quantitative Aptitude - Arithmetic Ability Questions

If (1/4 of x) - (4/5 of 6/7) equals - 9/7, then value of x is

How many natural numbers between 15 and 85 are divisible by 7?

Pipe A can fill an empty cistern in 4 hours while along with Pipe B it can fill it up in 3 hours. Only Pipe A is turned on for an hour after which Pipe B is also turned on. How much total time will it take to fill up the cistern?

Present age of R and S are in the ratio of 3 : 2 respectively. If the present age of H is 117 years and R’s present age is 4/13 of H’s present age, then after how many years the ages of R and S would be in the ratio of 15 : 11?

A man buys 10 oranges for Rs. 3 and sells 8 for Rs. 3. Calculate his gain percent.

If √x ­- √y = 1 , √x + √y = 17 then √xy = ?

Select the odd word/letters/number/number pair from the given alternatives.

The length of one side of a rhombus is 17 cm and one of the diagonals was 16 cm. Find the length of the other diagonal.