The length of the rectangle is 38 cm. How much will the area of this rectangle decrease

The length of the rectangle is 38 cm. How much will the area of this rectangle decrease if its width is reduced from 30 cm to 25 cm.

S = a * b, where a is the length, b is the width.

First, we find the area of a rectangle with a width of 30 cm:

S = 38 * 30 = 1140 cm2.

Now we find out what is the area of a rectangle with a width of 25 cm:

S = 38 * 25 = 950 cm2.

Further, it is easy to find how much the area of the rectangle has decreased:

1140 – 950 = 190 cm2.

Answer: the area of the rectangle has decreased by 190 cm2.