Answer:
11
Explanation:
Food coupons is $2 each and ride coupons is $3 each.
If Marlon spends all $40 on ride coupons, he can buy 40/3 ~ 13 coupons which is less than 15 coupons that he wants.
If he gets only 12 ride coupons, he will have 40-3*12=$4 left which will let him buy 4/2=2 food coupons. Those add up to 12+2=14 coupons which is still less than 15 coupons.
So the largest number of ride coupons he can buy is 11.