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This is a question on proportionality, but is best presented with the unknown quantity being the final term in the expression.

If 20' is proportional to 1" then 8' is proportional to how many inches?

20/8 = 1/n : n = 8/20 = 2/5 or 0.4 inch

NOTE : Like measurements, in this case feet and inches, are set out on opposite sides of the equation to enable the answer to be obtained.

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15y ago

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