Two sums are in the ratio 4:3. Both the sums are lent at 5% per annum and 10% per annum under compound interest for two years. The difference between the interest at the end of two years is Rs. 1540. What was the sum lent at 10% per annum?

A tank contains a mixture of 80 litre of milk and water. 70% of the milk and 30% of the water are drawn, therefore 55% part of the tank become empty. Find the initial quantity of milk and water in the tank.

If the circumference of a circle is 4.4 m, then the area of the circle (in m²) is :

The least number to be subtracted from 36798 to get a number which is exactly divisible by 78 is 

Direction (66-70): What should come in place of the question mark(?) in the following number series?

7, 8 , 17, 42, ?