Answer:
see below
Explanation:
4 brothers in total, each saves 17 per week, in 3 weeks
314+(17*4)*3 =518
yes they do have enough
How many weeks will it take for them to save enough $ to buy the gift
515 = x *(17*4) + 314
How much each of them must save per week to have enough?
515= 3(x*4) +314