Maria has $50 to spend on CDs and batteries for her CD player. She will buy a pack of batteries for $2.60. Let c represent the cost of one CD. Which expression represents the number of CDs she can buy with the $50?

Question

anonymous · Answer

A (50 – 2.60) ÷ c
B (2.60 – 50) × c
C (2.60 – 50) ÷ c

anonymous · Answer

A better question is why the heck is Maria buying CDs and a CD player!?
Anyway, we know that she will only have $47.40 to spend on CDs, because $50 - $2.60 is $47.40.
If CDs were $47.40, she could only buy one.
If CDs were $23.70, she could buy two.
If CDs were $11.85, she could buy four. 
So it seems as c decreases, the number of CDs she can buy, let's call d, increases. From this we can infer that if we divide the amount of money she has ($47.40) by c, we will get d.
So A. (50-260) / c