A wheel makes 48 revolutions in 3 seconds. How many revolutions does it make in 30 seconds

The mode of the observations 

2,3,7,8,4,2,4,3,9,2,7,4, is

If 20 men can build a wall 112 meters long in 6 days, what length of a similar wall can be built by 25 men in 3 days

The average of 5 nos. is 120. Later it was found that instead of entering correct value 15, data is wrongly entered as 5. Find the new correct average

A sum of money lent out at simple interest amounts to INR 720 after 2 years and to INR 1020 after a further period of 5 years. Find the interest rate %

The population of a village has a constant growth of 6.25% every year. If its present population is 82536 what was the population two years ago