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

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?

In a class of 60 where boys are twice that of girls, Ram ranked 17th from the top. If there are 9 boys ahead of Ram, how many girls are after him in rank?

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