The length of the rectangle is 60 meters. How much will the area of this rectangle decrease if its width

The length of the rectangle is 60 meters. How much will the area of this rectangle decrease if its width is reduced by 4 meters?

1. By the condition of the problem, the length of the rectangle is known – 60 meters.

The width of the rectangle is unknown.

Let’s designate it as X meters.

Then the area of the rectangle will be S1 = (60 * X) m2.

2. It is known that the width of the rectangle has been reduced by 4 meters.

Then it began to be (X – 4) meters.

The new area will be S2 = (60 * (X – 4)) m2.

3. Determine how much the area will decrease.

S1 – S2 = 60 * X – 60 * (X – 4) = 60 * X – 60 * X + 60 * 4 = 240 m2.

Answer: The area of the rectangle will decrease by 240 m2.