Quantitative Aptitude - Arithmetic Ability Questions

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

Present age of A is 2 times the present age of B. After 8 years the B's age will be 4 times of C's present age. If C celebrated his fifth birthday 9 years
ago, then what is the present age (in years) of A?

The least number of square tiles of side 41 cms required to pave the ceiling of a room of size 15m 17cm long and 9m 2 cm broad is:

A sum fetched a total simple interest of Rs 5320 at the rate of 7% per year in 5 years. What is the sum?

If two marbles are picked at random, what is the probability that either both are red or both are green?

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

What is the value of (1+cosA)/(1-­cosA)?

On a certain principal, simple interest amounts to Rs. 2,000 in two years at the rate of 10% p.a. What will be the difference in the amount of interest if the same is compounded on annual basis?