Hitomi has a total of 30 red and blue bowling balls at her bowling alley. Each red ball weighs 8 lb. each blue ball weighs 9 lb. If the total mass of the blue balls is 49 lb. heavier than the total mass of the red balls, how many red balls does she have???

Answer 1

Let x = # red balls, and 30 - x = # blue balls.

9(30-x) - 8x = 49

Solve for x.

Answer 2

i can't solve for X , it's confusing...