A container mixes 8 L of a 20% juice solution with 13 L of a 40% juice solution. How many litres of pure juice are in the mixture?

A) 34/5 L

B) 73/10 L

C) 63/10 L

D) 39/5 L

Answer: A

Explanation: Pure juice in each part equals its volume multiplied by its concentration.
8 × 0.20 + 13 × 0.40 = 34/5 L of pure juice.