If the length and width of a rectangle are increased by 4 meters, the area of the rectangle will be increased by 60 square meters. How many meters is the perimeter of the original rectangle

If the length and width of a rectangle are increased by 4 meters, the area of the rectangle will be increased by 60 square meters. How many meters is the perimeter of the original rectangle

Let the rectangle be long x wide y
(X+4)(Y+4)-XY=60
How to solve the equation
X=6
Y=5
Then the perimeter is (5 + 6) * 2 = 22
OK? Is it detailed enough^-^

If the length of a rectangle increases by 3 meters, its area increases by 12 square meters. If the width decreases by 2 meters, its area decreases by 10 square meters

The width of the original rectangle is 12 △ 3 = 4m
The length of the original rectangle is 10 △ 2 = 5m
The area of this rectangle is 5 × 4 = 20 square meters