The simple interest on a sum of money for 10 year is Rs. 3130. If the principal becomes 5 times after 5 years, then what will be the total interest (in Rs) obtained after 10 years? 

What should come in place of the question mark (?) in the following question?
24% of 420 × 50% of 74 = ?

Which is the smallest prime number? 

A man buys a scooter on making a cash down payment of Rs. 16224 and promises to pay two more yearly installments of an equivalent amount in the next two years. If the rate of interest is 4% per annum, compounded yearly, the cash value of the scooter, is 

A and B together can plough a field in 10 hours but by himself A requires 15 hours. How long would B take to plough the same field?

(53×87+159×21+106×25) is equal to 

Directions: The Bar Graph given here shows the population (in crores) of India in various census years. Observe the graph and answer the question based on it.  

Per year increase in population from the year 1931 to 1981 is 

In a college the number of students studying Arts, Commerce and Science are in the ratio of 3:5:8 respectively. If the number of students studying Arts, Commerce and Science is increased by 20%, 40%, and 25% respectively, what will be the new ratio of students in Arts, Commerce and Science respectively?