There are 27 brown cows and black cows in a field. Then some of the cows go into the barn. Now there are 38 cows in the field. How many cows went into the barn?

What is the missing step in this proof ?

Which expression is equivalent to -5(3x - 6/7)

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