  Math Central - mathcentral.uregina.ca  Quandaries & Queries    Q & Q    Topic: mixed units   start over

One item is filed under this topic.    Page1/1            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.      Page1/1    Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.    about math central :: site map :: links :: notre site français