What is the least integer that is a sum of three different primes each greater than 20 ?

A ferry, when empty, travels twice as fast as when it is full. It travels 20 miles south with a cargo, spends...

The average of five numbers is 25. After one if the numbers is removed, the average of the remaining is 31. Wh...

A bicycle has two wheels (one large and one small) of 120 cm and 40 cm in diameters. When the large wheel make...

An ambulance travels 10 miles at a speed of 75 mi,es per hour. How fast must the ambulance travel on the retur...

An amount of money was distributed among some people in such a way that it there had been 4 more people, every...

In a survey, it was found that 65% of the people surveyed watched the news on television, 40% read it on newsp...