Ashopkeeper bought a pen at rs 20 and sold at rs25 find his profit or loss

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.

The function f(x)= -(x+5)(x+1) is down. what is the range of the function?