# Square sides

If the square side increases by 28%, the square circumference increases by 11.2 meters. Find the length of the original square side.

Correct result:

a =  10 m

#### Solution:

4•(a+28/100a) = 11.2 + 4•a

4•(a+28/100•a) = 11.2 + 4•a

112a = 1120

a = 10

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