Which of the following fraction is the smallest?

$$7\over 6 $$,$$7\over 9$$,$$4\over 5$$,$$5\over 7$$

A mixture contains milk and water in the ratio of 7 : 8. If 10 litres water and 5 litres milk is added in the mixture then the ratio of water and milk becomes 3 : 2. Find the initial quantity in the mixture?

Out of an earning of Rs.720, Pankaj spends 65%. How much does he save?

Ajay spends 25% of his salary on house rent, 5% food grains, 15% on travel and 10% on clothes and saves Rs 27000, what is Ajay's monthly income?

Direction: Study the following information carefully and answer the questions given below.
 25% of the boys and 60% of the girls from a college participated in an event. The total number of girls in the college is equal to the number of boys, who do not participate in the event.

The number of girls, who participated in the event is what percent more than the number of boys, who participated in the event?

Direction: What should come in the place of question mark (?) in the following number series?

24, 25, ?, 41, -8, 73

By what least number should 21600 be multiplied to make it a perfect square?

What should be the least added to 41116 so that the sum is divisible by 8?