If the length of a rectangle is reduced by 8 cm and the width by 4 cm, the area of the original rectangle will be reduced by 92 square cm, and the rest is a square, the square How many square centimetres is the area of? It's a linear equation. It's OK

If the length of a rectangle is reduced by 8 cm and the width by 4 cm, the area of the original rectangle will be reduced by 92 square cm, and the rest is a square, the square How many square centimetres is the area of? It's a linear equation. It's OK

Let the side length of the new square be X
(x+8)(x+4)-x²=92
x²+12x+32-x²=92
12x=60
x=5
The area of a square is 25 square centimeters

A rectangular piece of paper, 8 cm long and 5 cm wide. If you cut it into the largest square, how much is the area reduced?

Decrease: (8 × 5-5 × 5) / (8 × 5) = 37.5%

There is a rectangular piece of paper. First, the length is cut off by 8 cm, and then the area is reduced by 72 square centimeters. Then, the width is cut off by 5 cm, and then the area is reduced by 60 square centimeters
How many square centimeters is the area of this rectangular piece of paper

72 ÷8＝9 60÷5＝12
12+8＝20 20×9＝180