The third proportional of two numbers 4 and 20 is

A and B start a common business by placing their capital in the ratio of 5: 6. After 8 months A withdraws his capital. They received dividends in the ratio of 5: 9. For how long did B invest his capital?

The total surface area of a cube is 864 square cm. What will be its volume?

If 50% of (x −y) = 30% of (x + y), then what percent of x is y? 

The perimeter of two squares are 40 cm and 32 cm. The perimeter of a third square whose area is the difference of the area of two square, is 

If x + y = 1 and xy (xy – 2) = 12,then the value of x⁴ + y⁴ is:

Find the length of a tangent, drawn to a circle of radius 4 cm, from a point which is at a distance of 5 cm from the centre?

If the perimeter of a rhombus is 80 cm and one of its diagonals is 24 cm, then what is the are (in cm²) of the rhombus?