Question

An original rectangle has a length of ten and a width of twenty-eight. What happens to the area if the new width is one quarter the original width? Verify your answer.

Answer 1

The area(noted A) of a rectangle is its length(noted l) multiplied by its width(noted w):
A = l * w

So the original area in your problem is:

A = 10 * 28 = 280

Find the new width:

w' = 28/4 = 7

Then calculate the new area with it and the old length:

A' = 10 * 7 = 70