A corner store sells two kinds of baked goods: cakes and pies. A cake costs $5 and a pie costs $7. In one day, the store sold 15 baked goods for a total of $91. How many cakes did they sell?
A. 8 cakes
B. 7 cakes
C. 4 cakes
D. 5 cakes

Question

A corner store sells two kinds of baked goods: cakes and pies. A cake costs $5 and a pie costs $7. In one day, the store sold 15 baked goods for a total of $91. How many cakes did they sell?
  A. 8 cakes 	
  B. 7 cakes 	
  C. 4 cakes 	
  D. 5 cakes

anonymous · Answer

c+p=15 (multiply by 5) =5c+5P=75
5c+7P=91
subtract 1st from 2nd=> 2p=16
p=16/2=8
substitute p into 1st: c+8=15
c=15-8=7

Therefore 8 pies and 7 cakes

Answer is b.7 cakes