What fraction of the bottle does Halle drink after school starts but before lunch?

Question

Before the question:

Every morning, Halle goes to school with a 1-liter bottle of water. She drinks 1/4 of the bottle before school starts and 2/3 of the rest before lunch.

Answer 1

After she drinks ¼L, she has ¾L remaining. If she then drinks 2/3 of this, then 1/3 of this ¾L will remain, and because one third of three fourths means MULTIPLICATION, we get ¼L remaining (at lunchtime).