Wendy bought the lemonade and iced tea for the school picnic. Since more people like lemonade than iced tea, she brought 2 gallons of lemonade for every 10 people. She also brought 5 gallons of iced tea for people who don't like lemonade.
Write an algebraic expression to show how many gallons Wendy would need to bring. Let n represent the number of groups of ten people.