There are n students in a school. If r% among the students are 12 years or younger, which of the following expressions represents the number of students who are older than 12?

The ratio between the perimeter and the breadth of a rectangular is 5 : 1 . If the area of the rectangle is 21...

If (x +y) >5 and (x -y)> 3, then which of the following gives all and only possible values of x?

Three boys have marbles in the rotio of 19 : 5 : 3 If the boy with the least number has 9 marbles , how many m...

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

In a class of 120 students 70 percent can speak only Bengali and the rest can speak English . If 25 percent of...

A lamp is manufactured to sell for $35.00, which yields a profit of 25% of cost . If the profit is to be reduc...