The width of the rectangle is 23 cm. How much will the area of this rectangle increase if the length is increased by 3 cm?

To solve this problem, recall the formula for the area of a rectangle. The area of the rectangle is equal to the product of the length and the width. S = a * b, where a is the length and b is the width. Let the length be a and the width is 23 centimeters. Let’s calculate what the area is equal to.
S1 = 23 * a = 23a.
Let’s increase the length by 3 centimeters.
(a + 3) cm.
Let’s calculate the area.
S = (a + 3) * 23 = 23a + 69.
23a + 69 – 23a = 69.
Answer: 69 square centimeters more.