Running at the same constant rate, 6 identical machines can produce a total of 270 bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes ?

A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes....

How many prime numbers are less than 50 ?

Two numbers are in the ratio 1:2. If 7 is added to both, their ratio changes to 3:5. The greatest number is :

The simple interest on a certain sum of money for 2 1/2 years at 12% per annum is TK. 40 less than the simple...

The sum of two numbers is 28/25 of the first number. The second number is what percent of the first ?

A water tank is two-fifth full. Pipe A can fill a tank on 10 minutes and pipe B can empty it in 6 minutes. If...