Final answer:
The correct answer is a) 10. A total of 51 drinks were provided by a parent and a teacher, leaving 9 drinks still needed. As the options are integers, rounding up from 9 means at least 10 more drinks are required.
Step-by-step explanation:
The student's question asks how many drinks are still needed for a party if 60 drinks are needed in total, a parent donated 0.25 of the drinks, and a teacher brought 3/5 of the drinks.
First, let's calculate the number of drinks donated by the parent: 0.25 x 60 = 15 drinks.
Next, we'll determine the number of drinks the teacher brought: 3/5 x 60 = 36 drinks.
Now, we add up the drinks already provided: 15 (from parent) + 36 (from teacher) = 51 drinks.
To find out how many drinks are still needed, we subtract the drinks provided from the total needed: 60 - 51 = 9 drinks. However, since 9 is not one of the options provided and we must round up to ensure there are enough drinks for all 60 guests, we need at least 10 more drinks. Thus, the correct answer is a) 10.