Perimeter 20283

If we increase the length of one pair of opposite sides of the square by 2 cm and the length of the other two sides by 1 cm, we will create a rectangle, the perimeter of which will be 10% larger than the perimeter of the original square. What is the side length of this square?

Correct answer:

a =  15

Step-by-step explanation:

2(a+2)+2(a+1) = 1.10 · 4a

2·(a+2)+2·(a+1) = 1.10 · 4·a

0.4a = 6

a = 6/0.4 = 15

a = 15

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