Quantitative Aptitude - Arithmetic Ability Questions

Among four students sitting in a row, average age of last three students is 20 years and the average age of first three students is 21 years. If the age of first student is 26 years, then what is the age (in years) of the last student?

If a perfect square, not divisible by 6, be divided by 6, the remainder will be

In the following question, select the missing number from the given series.1 108, 81, 54, 27, ?

The value of 1+tan2∅(1-sin2∅) is

Koushik can do a piece of work in X days and Krishnu can do the same work in Y days. If they work together, then they can do the work in

In ΔABC measure of angle B is 90 deg. If cosA = 5/13, and AB = 10 cm, then what is the length (in cm) of side BC?

What is the reflection of the point (-1 , 5) in the line x = 1?

If 22, x, 88 are in a continued proportion, find the value of x.