SOLUTION: The perimeter of a triangle is 64 cm and the lengths of the sides have a ratio of 3:5:8. Find the longest side of the triangle in centimeters. i can't figure out how to set thi

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Question 952177: The perimeter of a triangle is 64 cm and the lengths of the sides have a ratio of 3:5:8. Find the longest side of the triangle in centimeters.
i can't figure out how to set this problem up. Thanks for the help!

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
The perimeter of a triangle is 64 cm and the lengths of the sides have a ratio of 3:5:8. Find the longest side of the triangle in centimeters.
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ratio of 3:5:8 means the sides lengths are 3 times something, 5 times something and 8 times something (the same something for each).
--> 3x + 5x + 8x = 64
16x = 64
x = 4
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Sides are 12, 20 and 32 cms