What is the difference between compound interest and simple interest on Rs. 2500 for 2 years at 4% per annum?

Two years ago, the ratio of the age (in years) at A and B was 2:3. The ratio of their respective ages, three years from now, will be 3:5. What will be the ratio of respective ages of A and B, 6 years from now?

Directions: Study the following data and answer the questions. 

The score of students of a class are given as follows :

The number of students whose IQ score is 100 and more is 

Directions: The bar graph given below shows the production (in ' 000 tones) of rice of a country for the year 2007 to 2011. Study the graph carefully and answer the question given below it.

The production of rice in the year 2011 is what percent of the production of rice in 2010?

By what least number should 4320 be multiplied so as to obtain a number which is perfect cube? 

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

1.7 5.4 19.2 80.8 409 ?

If N:38∷ 3:57, Find N.

A contractor undertakes to finish a certain work in 124 days and employed 120 men. After 64 days, he found that he had already done 2/3 of the work. How many men can be discharged so that the work may finish in time ?