Answer:
9 ft
Explanation:
Let x represent the shortest piece. Then the sum of lengths is ...
x + (x +25) +3x = 40
5x = 15
x = 3
3x = 9
The third piece is 9 feet long.
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Check
The pieces are 3 ft, 28 ft, 9 ft, so total 40 ft, as required.
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