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Right triangle ABC is similar to triangle XYZ, because angle B is congruent to angle Y. If side AB equals 15 inches, side BC equals 45 inches, and side YZ equals 9 inches, then what is the length of side XY?

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XY/AB = YZ/BC,
XY/15 = 9/45,
Multiply both sides by 15:
XY = 135/45 = 3.

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