A boy wants to open a drink stand. His mother says he cannot sell more than four gallons of drinks. The boy sells lemonade and a fruit juice. He sells the lemonade for $2 a gallon and the fruit juice for $1.50 a gallon. The lemonade uses 30 lemon slices per gallon and one pound of sugar er gallon. The fruit juice uses 10 lemon slices and two pounds of sugar per gallon. The boy’s mother has only 90 lemon slices and 6 pounds of sugar. Find out how many gallons of each type of beverage the boy should make in order to make the most money.

using graphic method