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Express the ratio of 3 ft to 18 in lowest terms

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1\ ft=12\ in\to3\ ft=3(12\ in)=36\ in\\\\3\ ft:18\ in=36\ in:18\ in=36:18=(36)/(18)=(2)/(1)=2:1\\\\Answer:\ \boxed{3\ ft:18\ in=2:1}

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