SOLUTION: I need help. I have no idea how to solve this word problem using the five step method. A new edition of a video game costs $60, but it's previous version only costs $40. If 15 game

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: I need help. I have no idea how to solve this word problem using the five step method. A new edition of a video game costs $60, but it's previous version only costs $40. If 15 game      Log On


   

Question 296158: I need help. I have no idea how to solve this word problem using the five step method. A new edition of a video game costs $60, but it's previous version only costs $40. If 15 games are sold for $840, how many copies of the newest game sold?
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
not a percentage or ratio problem but def an algebraic problem
40a%2B60b=840
a+b=15
a=15-b
40%2815-b%29%2B60b=840
600-40b%2B60b=840
600%2B20b=840
20b=240
b=12%7D%7D%0D%0A%7B%7B%7Ba=15-b
a=15-12
a=3
a= previous version
b= new version
so
12 new versions and 3 previous versions