There are 15 chairs in a row. Position of P is at the middle, and Q is at 12th position counting from the right. How many chairs are there between P and Q?

In a line of boys, Satish is 12th from right and 4th from left. How many boys should be included in this line so that their total number becomes 28?

Nitin is 7 ranks ahead of Joginder in a class of 39. If Joginder's rank is 17th from the last, what is Nitin's rank from the begining?

Eleven friends meet at a party. Each one shakes hand with each of the others once. The number of possible hand shakes is

If the simple interest on a sum of money at 5% per annum for 3 years is Rs. 1,200, find the compound interest on the same sum for the same period at the same rate.

A train 110 m long is travelling at a speed of 58 kmph. The time in which it will pass a passerby walking at 4 kmph in the same direction is