Asked by Anonymous

The length in feet of three ropes are consecutive multiples of three. If each rope were 4 feet shorter, the sum of their lengths would be 42 feet. Find the lengths of the three ropes.
Answered by Steve
If the lengths are 3x-3,3x,3x+3, then

3x-7 + 3x-4 + 3x-1 = 42
x = 6

The ropes are 15,18,21
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