Two -fifth of one -fourth of three seventh of a number is 15. what is the half of the number ?

Length of a train is 170 meters and speed of train is 63 km / hr . This train can pass a bridge in 30 seconds...

A water tank has two taps (Tap1 -Tap2) . Tap -1 can fill a tank in 8 hours and Tap- 2 can empty the tank in 16...

A cylindrical rod of iron, whose height is equal to its radius ,is melted and cast into spherical balls whose...

A company produces five types of shirts -- A,B,C,D and E-using cloth of three qualities -- high, medium and lo...

Rahim borrowed Tk. 800 at 6% per annum and karim borrowed tk. 600 at 10% per annum .After how much time, will...

The average of 6 numbers is 25. If 3 more numbers, with an average of 22 are added to these numbers, what will...