Salam's average in four test is 80%. What mark does she need to score in her fifth test to make her average 84%?

The area of a rectangle is 200 sq. meter . If the length is twice the breadth , what is the perimeter of the r...

Perimeter of rectangle is 200 meter. Its width is 3/7 of its length . What is the length in meter ?

A company makes a profit of 5% in its first TK. 1000 of sales each day , and 4% on all sales in excess of TK....

How much interest will TK. 2000 earn at an annual rate of 10% in one year if the interest is compounded every...

The monthly salary of a person is increased by 10% in one month, but is decreased by 10% in the next month . W...

Average age of three brothers is 16 years . Average age of these brothers along with their father is 25 years....