Q3.

The present age of a father is thrice that of his son. After 15 years, the age of the father will be twice that of his son. What is the present age ( in years) of the father?

Q4.

A cylindrical water tank has a radius of 7 cm and a height of 10 cm. What is its volume? 

(Use \(\pi = \tfrac{22}{7}\))

Q5.

The largest four-digit number which when divided by 14, 15 and 8 leaves remainder 4 in each case is: