3. In a barrel of juice there are 30 liters; in a barrel of wine there are 80 liters. If the price ratio of a barrel of juice to a barrel of wine is 3:4, what is the price ratio between one liter of juice and one liter of wine?
Sol: Pick numbers: a barrel of wine costs Rs 40 and a barrel of juice costs Rs 30 according to the given ratio. One liter of wine will cost 50 paise and one liter of juice will cost Re 1. Therefore the price ratio is 2:1. The correct answer is B.