One filling pipe P is three times faster than another filling pipe Q , If P can fill the tank in 24 hours, then what is the time taken to completely fill the tank if both pipes are opened together?

A box contains 4 tennis ball 6 season and 8 dues balls . 3 balls are randomly drawn from the box. What is the...

Rahim and Karim donated Tk. 100. each in charity . Karim gives each tk. 1 more than Rahim and Rahim distribute...

A square is inscribed in a circle of diameter 2 a sand another square is circumscribing circle. The difference...

The income of 'A' is 20% higher than that of 'B' . The income of 'B' is 25% less than of 'C' What percent less...

is equal to -

There are n students in a school . If r% among the students are 12 years or younger, which of the following ex...