Simplify the following expression.

$\frac{7.35\times7.35-2.25\times2.25}{0.24}$

Avinash’s monthly salary is ₹50,000 and his monthly expenditure is ₹18,000. Radha’s monthly salary is ₹60,000 and her monthly expenditure is ₹24,000. Find the ratio of Radha’s savings to Avinash’s saving’s.

A can finish a job in 8 hours and B can finish the same job in 12 hours independently. If they work simultaneously, in how many hours can they do the same job?

The following pie charts show the data of the number of appeared and passed students of class 12 in sections A, B, C, D and E.

How many students failed in Section C?