There is a difference of 8 years between the ages of Waqar and Naseema. When they were married 30 years ago. So 4 times Waqar's age was equal to 5 times Nasima's age. What is the sum of his present age?

A water reservoir has two inlets and one outlet. Through the inlet it can be filled in 3 hours and 3 hours 45 minutes respectively. It can be emptied completely in 1 hour by the outlet. If the two inlets are opened at 01 : 00 pm and 02 : 00 pm respectively and the outlet at 03 : 00 pm then it will be emptied at : 

A man can row with the stream at 9 km/hr. and against the stream at 3 km/hr. His speed in still water is -

Rekha bought a scooter for Rs 20,000 and sold it for Rs 22,000. What is the profit percentage?

The simple interest on Rs. 12000 at a certain rate of interest in five years is Rs. 7200. Find the compound interest on the same amount for five years at the same rate of interest.