how do i find the length of each side of a triangle if the perimeter is 120?

A triangle has a perimeter of 120 meters.  The length of the second side is double the first side. The length of the third side is 12 meters longer than the first side. Find the length of each side.
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1 Answer

2nd = 2 * 1st

3rd = 12 + 1st

1st + 2nd + 3rd = 120

1st + 2 * 1st + 12 + 1st = 120

4 * 1st + 12 = 120

4 * 1st = 108

1st = 27

2nd = 2 * 1st = 54

3rd = 1st + 12 = 39

Answer:  27 meters, 54 meters, and 39 meters.
by Level 13 User (103k points)

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