You are correct! The problem can be interpreted in two different ways.
If we consider that Alex took 1/4 of the bottle for breakfast and then drank 1/2 of the remaining milk for his snack, we can calculate the remaining amount as follows:
Left = Started - Drank
= 1/4 - (1/2 * 1/4)
= 1/4 - 1/8
= 2/8 - 1/8
= 1/8
So, if we consider that he started with 1/4 of the bottle, and he drank 1/2 of the remaining milk for his snack, 1/8 of the milk would be left after the snack.
However, if we interpret the problem as Alex initially having a full bottle of milk and using 1/4 of it for breakfast, then 3/4 of the milk would be left. If he then drank 1/2 of this remaining milk for his snack, the calculation would be as follows:
Left = 1/2 * (3/4)
= 3/8
So, in this case, 3/8 of the milk would be left after the snack.
Both interpretations are reasonable, and it's important to clarify with the problem statement to ensure a correct answer.