Square sides

If we enlarge the side of the square by a third, its circumference will be 20 cm larger than the original. What is the side of the square?

Correct answer:

x =  15 cm

Step-by-step explanation:


4(x+x/3)=4x+20

4•(x+x/3)=4•x+20

4x = 60

x = 15

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