Algebra word problem.

Question

A punch recipe calls for 1 liter of lemon soda for every 3 liters of fruit juice. If a woman uses 10 liters of fruit juice, how many liters of lemon soda would she need?

Answer 1

You have a ratio of 1/3 so you can say:

1/3=x/10

3x=10

x=3 1/3 liters of lemon soda