Question 1189607
 Ashley had 24 math problems for her homework.
 Her father made the following deal with her.
 He said "I'll give you $5 for every problem you got right, but you pay me $3 for every problem you got wrong."
 If Ashley broke even on this deal, how many problems did she get correct? 
Write an equation to solve the problem. 
:
let r = no. of problems she got right
then
(24-r) = no. she got wrong
:
5r = 3(24-r)
5r = 72 - 3r
5r + 3r = 72
8r = 72
r = 72/8
r = 9 problems right
:
;
Check this; she got 24 - 9 = 15 problems wrong
5*9 = $45
3*15 = $45