I don't know

Question

A woman bought a number of items for $36. She realized that if she had bought 12 more items for the same money, she would have paid $4 less per item. How many items did she buy?

Answer 1

36/6 = 6

 

36/18 = 2

 

36/n - 4 = 36/(n + 12)

 

36(n + 12) - 4n(n + 12) = 36n

36n + 432 - 4n² - 48n = 36n

n² + 12n - 108 = 0

(n + 18)(n - 6) = 0

 

n + 18 = 0

n = -18

This answer is out!

 

n - 6= 0

n = 6