Question 1035423
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S=shorter (first) side; S+5ft=second side; 2S-5ft=third side
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Perimeter=First side + second side + third side
48 feet=S+(S+5 ft)+(2S-5 ft)
48 feet=4S
12 feet=S 
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ANSWER 1: The first side is 12 feet long.
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Second side = S + 5 ft = 12 feet + 5 feet = 17 feet
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ANSWER 2: The second side is 17 feet long.
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Third side=2S-5 feet=2(12 feet)-5 feet=24 feet-5 feet=19 feet 
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ANSWER 3: The third side is 19 feet long.
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CHECK:
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Perimeter = first side + second side + third side 
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48 feet = 12 feet + 17 feet + 19 feet
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48 feet=48 feet
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