Quantitative Aptitude - Arithmetic Ability Questions

The least number to be added to 435 to make it a perfect square is

The area of a semicircle is 1925 cm2. Calculate its perimeter (in cm).

Two pipes X and Y can individually fill a tank in 48 and 72 min respectively. If they are opened simultaneously, how long will it take for the tank to fill? 

What is the value of a2 + b2a3 - b3, when a + b = 8 and a - b = 2?

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

In the following question, four number pairs are given. The number on left side of (–) is related to the number on the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the

What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?

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?