Xiao Ming's weight is one fifth lighter than his mother's, and his father is three fifths heavier than his mother's

a half

A box of 1 liter milk, mother drank 1 / 5 liter, father drank 1 / 3 liter, Xiao Ming also drank 1 / 3 liter, how many liters of milk did the three people drink?

1 / 3 + 1 / 3 + 1 / 5 = 1 / 15 (liter) in fact, you should pay attention to the fact that there is a unit after the score~

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