Everybody in a room shakes hand with everybody else. Find the number of persons if the total number of hand-shakes is 66.

The organisers of an eassy competition decide that a winner in the competition gets a prize of Rs 100 and a participant who does not win gets a prize of Rs. 25. The total prize money distributed is Rs 3,000. Find the number of winners, if the total number of participants is 63.

Find the total number of 9 digit numbers having all different digits.

When you shake hand with you friend, what kind of force do you exert?

If 60% people in a city like cricket, 30% like football and the remaining like other games, then what per cent of the people like other games? If the total number of people are 50 lakh, find the exact number who like each type of game.

Out of some shirts brought for sale, 10 were found to be defective.If the probability of a randomly chosen shirt being not defective is 4/5,then find the total number of shirts brought for sale.

A cottage industry produces a certain number of pottery articles in a day.It was observed on a particular day that the cost of production of each articles (in rupees)was 3 more than twice the number of articles produced on that day.If the total cost of production on that day was Rs.90,find the number of articles produced and the cost of each articles.

A persion clapped his hands in front of a wall and heard echo later 1s. If speed of sound m air is 330 m/s, find out the distance between the person and the wall.

Word Problem on Numbers The ratio of income of two persons is 9 : 7 and the ratio of their expenditure is 4 : 3 . If each of them save rupees 200 per month, find their monthly income.