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 Topic: mixed units
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 Ratios and proportions with mixed units 2010-05-13 From Kenneth:Is it incorrect to have a proportion with numbers containing units that are not the same on both sides of the equal sign? Here is an example: \$0.07/\$1.00 = ?/\$0.89 is okay, but if I add a different unit (20 ounces) to one side of the equal sign but not the same unit to the other, is the proportion incorrect? \$0.07/\$1.00 = ?/\$0.89/20 ounces. In order to determine the missing amount, the calculation becomes (\$0.07/\$1.00)/\$0.89/20 ounces = \$?, but is this proportion correct with the units as they are? Two dollar-units cancel leaving dollar/ounces equals \$?/ounces, but is this correct?Answered by Robert Dawson.

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