This problem is a math worksheet in order to get the answer you must first a series of question, then you need to decode the answer. So the following are the answers:
1. G
2. O
3. A
4. R
5. I
6. H
7. L
8. E
9. W
10. M
11. N
12. T
Then plugin the following in this: 9 6 8 11 8 3 12 5 11 1 9 3 8 12 8 4 10 8 7 2 11
THE ANSWER IS:
WHEN EATING WATERMELON. To explain this we only eat the red parts in the watermelon, not the green parts.
To further understand the answers, I attached the worksheet.