In the adjoining figure ABCD is a square. Four equal semicircles are drawn in such a way that they meet each other at O. AB, BC, CD and AD are diameters each equal to 8 cm. Find the area of the shaded region.

If 70% of students in a school are boys and total number of girls in the school is 420, then the number of boys in the school is

If in train-R 34 percent of the passengers are females and 26 percent are children, what is the number of males in that train ?

Number of passengers in the train-Q is approximately what percentage of the total number of passengers in train-A and train-R ?

What was the approximate average number of passengers in train-S, train M and train-L together?

The expenditure on food is how much per cent more than the expenditure on savings?

If the total salary of the person is Rs. 50000, what will be the expenditure (in Rs.) on Rent?

If the expenditure incurred on Clothes is Rs. 3000, what is the expenditure (in Rs.) incurred on Education?

What is the central angle (in degrees) made by the sector of expenditure on Education?

The central angle made by the sector of expenditure on fuel is how much more (in degrees) than the central angle made by the sector of expenditure on clothes, if the ratio of the expenditure on fuel and clothes is 4 : 3 respectively?