Find the odd one out.

How many numbers between 120 and 980 are multiples of 9?

Find the sum of the given arithmetic series up to 10 terms:

2 + 6 + 9 + 12 + 15 + ...

A coin is tossed FIVE times. What is the probability that there is at the least one tail? 

A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is: 

A tree increases annually by 1/8th of its height. By how much will it increase after 2 years, if it stands today 64 cm high?

Mohan's salary was first increased by 20% and then decreased by 20%. If his present salary is Rs. 7200, what was his original salary?

If the lengths of two sides of a triangle are 5 and 9, respectively, which of the following could be the length of the third side of the triangle?

The tax on a commodity is diminished by 20%, but its consumption is increased by 10%. Find the percentage decrease in the revenue derived from it.

A group of 45 men is employed to complete some work in 58 days. After 40 days, an additional 15 men are employed, and the work is finished three days earlier. If the additional men had not been employed, how many more days would it have taken beyond the expected period (extra time)?