Can u explain to me how to get the answer? ?

Basically all you have to do is to find what the question is telling you and the unit you will get it from the question example: 15 is what percent of 90 so first work out the question then the unit is percent% because they say what percent.
 
hope i helped

To determine the percent of a number do the following steps:1.Multiply the number by the percent 2.Divide the answer by 100 (Move decimal point two places to the left) 3.Round to the desired precision 

length is  4 times greater than breadth

Step-by-step explanation:

We know that , area of rectangle is given by

A=length*breadth ( equation 1)

given is A=4x^2

4x^2=(4x*x)

comparing with equation 1 we get ,

length=4x.

breadth=x.

hence  4 coefficient tell that length is 4 times greater than breadth.