Question

Christy bought an 8 foot piece of lumber to trim a bookshelf. Altogether, she needs 100 inches of lumber for the trim. Did Christy buy enough lumber? Explain

Please help on this problem
Ms. Sue
8 * 12 = _______ inches

Patrick
Why did you pick the number 12? That is what I am not understanding.
Ms. Sue
1 foot = 12 inches