Kristin spent $131 on shirts. Fancy shirts cost $28 and plain shirts cost $15. If she bought a total of 7. How many of each kind she bought?

Question

which of these is the correct answer to the question.

 

A. 3f+4p=$131

 

B.4f+3p=$131

 

C.2f+3p=$131

 

D.5f+2p=$131

Answer 1

Let f = the number of fancy shirts Kristin bought

Let p = the number of plain shirts Kristin bought

f + p = 7     p = 7 - f

28f + 15p = 131

28f + 15(7-f) = 131

28f + 105 - 15f = 131

13f = 26

f = 2

p = 7 - f = 7 - 2

p = 5

 

The answer is 2f + 5p = 131     In this case f = the cost of a fancy shirt and p = the cost of a plain shirt.