Quantitative Aptitude - Arithmetic Ability Questions

Two pipes P and Q can fill an empty tank in 25 hours and 20 hours respectively. Pipe R alone can empty the completely filled tank in 50 hours. Firstly both the pipes P and Q are opened and after 8 hours pipe R is also opened. What will be the total time (in hours) taken to completely fill the tank?

What is the sum of the first 13 terms of an arithmetic progression if the 5th term is 1 and the 8th term is -17?

Find the average of all prime numbers from 1 to 50.

A wheel has diameter 84 cm. The number of complete revolution it will take to cover 792 m is

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

If the amount received at the end of 2nd and 3rd year at Compound Interest on a certain Principal is Rs 25088, and Rs 28098.56 respectively, what is the rate of interest?

What is the equation of the line perpendicular to the line 2x + 3y= -6 and having Y-intercept 3?

Four numbers A, B, C and D are such that their overall average is 16. The average of A and B is 9.5. The average of C and D is