If 18 identical machines required 40 days to complete a job, how many fewer days would have been required to do the job if 6 additional machines of the same type had been used from the beginning?

There are 20 members in a football squad. In electing a captain and a vice-captain, how many different outcome...

If 4 is subtracted from one-fourth of a number, the result in 20. Which of the following is the number ---

The area of a rectangle R with width 4 feet is equal to the area of a square S which has a perimeter of 24 fee...

Salma's average in four tests is 80%. What marks does she need in her fifth test to raise her average to 84%?

How many of the positive integers less than 25 are 2 less than an integer multiple of 4?

A machine fills a bag with 7 ounces of potato chips in 3.5 seconds. At this rate, how many seconds will take t...