The average of a a, b, c is 6 and a-b =4, ab = 21, What is the value of c ?

A truck driver must complete a 180-mile trip in 4 hours. If his average speed is 50 miles per hour for the fir...

Son's age is now one-third of father's age. In twelve years from now son's age will be one half of the father'...

A man walked 2 miles east, then 2 miles south , then again 4 miles east and finally 10 miles north. How far di...

The ratio of boys and girls in a class is 1:2 and the class as 24 students . How many boys would have to be ad...

A book sells for TK. 65. This price gives the seller a profit of 30% on his cost. What will be the new selling...

A wheel makes 1000 revolutions in covering a distance of 88 km. The diameter of the wheel is -