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A rectangular board is 40 cm long. According to the next largest square, what is the perimeter of the remaining rectangle?
Let the original width be x cm, 0 < x < 40
According to the length of the next largest square, x,
The perimeter of the remaining rectangle
=2 * (40-x) + 2x = 80-2x + 2x = 80cm
When the length and width of a rectangle are increased by 4cm, the area is increased by 40cm, so what is the circumference of the original rectangle
Who will? I'm in a hurry
Let the original length x width y
4*x+4*y+4*4=40
We get x + y = 6
So the perimeter is 12
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