Ribbon on the cube

A cubical gift box is tied with a piece of ribbon. If the total length of the free ends and the bow is 18 inches, what is the length of the ribbon used? (Each side of the cube is 6 inches).

Correct result:

x =  66 inch


a=6 inch b=18 inch  x=8 a+b=8 6+18=66 incha=6 \ \text{inch} \ \\ b=18 \ \text{inch} \ \\ \ \\ x=8 \cdot \ a + b=8 \cdot \ 6 + 18=66 \ \text{inch}

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