To make a puzzle, Denzel draws lines a and b to cut along on a
square piece of posterboard. He wants to draw line c so that it is
parallel to line b.
What should the
measure of 21 be?
Explain.

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups