For the question to find the sum of all natural numbers that are divisible by 3 or 5, but do not exceed 100, none of the answers are correct. It didn't take me long to find the correct answer using Excel. 2733 is the correct answer. It wouldn't be hard to figure out manually either, but it would take a little longer. Anyone who made it into high school could figure it out.
As far as cheating with a girl you just met, better to fail a subject on your own merit than to cheat. If a subject is hard for you, you study it, and you get better at it.
I quit the game when the protagonist went to the park with her at night. Good luck.