Michael J. answered 03/08/17
Tutor
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Effective High School STEM Tutor & CUNY Math Peer Leader
Similar shapes have corresponding sides that are proportional to each other. In other words, their ratios are the same.
Ratio of tile length = ratio of tile width
small tile length / large tile length = small tile width / large tile width
10 / 15 = 15 / x
where x is the width of the similar rectangle