Mom pays $116 each week for groceries plus $28 for each fast-food dinner. she has $200 to spend each week for all the family's food. which equation can mom use to find f, the number of times fast-food can be bought, when exactly $200 is spent on food for the week?

a) 28 + 116 f = 200
b) 116 + 28 f =200
c) 28 f = 200
d) 116 f =200

So 116 is fixed since she only buys groceries once
the 28 dollares can be spent many times since it is per dinner and there are 1 dinner per night and 7 nights per week so

cost of groceries+cost of fast foods=total cost=200
cost of groceries stays at 116
cost of fast food=cost per dinner times number of dinners
number of diners=f so
116+28 times f=200
116+28f=200

answer is B