Please help! answer and explanation?

In the diagram of circle a what is m

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

Which expression is equivalent to -12(3x-3/4)