I will upvote on every answer.

Amy and her sister are making lemonade for the school dance. Their recipe makes 2 quarts of lemonade. If they make 35 times the recipe, how many gallons of lemonade will Amy and her sister have?

1 serving is 2 quarts

so 35 servings is 35 times the quantity of 1

the amount of 1 serving is 2 quarts

2 times 35=70 quarts

but wait, there's more

they want it in gallons

so

4 quarts=1 gallon

divide by 4

1 quart=1/4 gallons

we got 70 quarts

70 times 1/4=70/4=35/2=17.5 gallons

they have 17.5 gallons or 17 and 1/2 gallons