Problema Solution
The side of an equilateral triangle is 4 inches shorter than the side of a square. The perimeter of the square is 42 inches more than the permimeter of the triangle. Find the length of a side of the square.
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Solution:
st = ss - 4
4ss = 3st + 42
4ss = 3(ss-4) + 42
4ss = 3ss - 12 + 42
ss = 30 inches