Rakib can complete a task in 30 minutes, and together with his brother Momin, he can complete the task in 20 minutes. How long would it take for Momin working alone to complete the task?

What percentage of numbers from 11 to 90 has 0 or 5 in the unit's digit?

Hamed is 7 years older than his brother Shaquib, who is twice as old their younger sister Lopa. if Lopa is 15...

There are 4 women and 4 men sitting in a waiting room for job interview. If two of the applicants are selected...

Which one of the following is the minimum value of the sum of two integers whose product is 36?

If the sum of three consecutive integers is less than 75, what is the greatest possible value of the smallest...

A 12 gallon tub has a faucet that lets water in at a rate of 3 gallons per minute, and has a drain that lets w...