A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14, and x. He found the mean to be 12. What should be the number in place of x ?

Find the smallest number by which 5808 should be multiplied so that the product becomes a perfect square .

The interest on a certain deposit at 4.5% p.a. is TK. 202.50 in one year. How much will the additional interes...

2-[ 2 - { 2 - 2 ( 2 +2 ) } ] = ?

If 0.4 of a number is equal to 0.06 of another number, the ratio of the numbers is :

The breadth of a rectangular field is 60% of its length . If the perimeter of the field is 800 m, what is the...

Peter purchased a machine for TK. 80,000 and spent TK. 5,000 on repair and TK. 1,000 on transport and sold it...