In a class , the ratio of the number of boys to girls is 5 : 3 . What percent of the students of the class are girls ?

A jar contains 10 red marbles and 30 green marbles . How many red marbles must be added to the jar so that 60%...

Karim drove for h hours at a constant rate of r miles per hour . How many miles did he go during the final 20...

What is the are a of a square (in sq. meter) if its perimeter is 40 meter ?

1 + 2 + 3 + .................. + 100 = ?

Karim has exactly 3 times as many Bangladesh as non-Bangladesh stamps in his collection . Which of the followi...

From 2004 to 2005. the sales of a book decreased by 80%. If the sales in 2006 were the same as in 2004, by wha...