Question

Rick knows that 1 cup of glue weighs 1/18 pound. He has 2/3 pound of glue. How many cups of glue does he have?

Answer 1

`\begin{array}{ccc}1\ cup&-&(1)/(18)\ lb\ (pound)\\\\x\ cup&-&(2)/(3)\ lb\ (pounds)\end{array}\ \ \ \ \ \ cross\ multiply\\\\\\(1)/(18)x=1*(2)/(3)\\\\(1)/(18)x=(2)/(3)\ \ \ \ \ \ |multiply\ both\ sides\ by\ 18\\\\18*(1)/(18)x=18*(2)/(3)\\\\x=6*2\\\\\boxed{x=12}\\\\Answer:He\ has\ 12\ cups\ of\ glue.`