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Question: Jason's allowance lets him save $6 per week. He wants to buy a music system with his savings. His parents agree to contribute $86 upfront. The music system costs $158. Solve the equation 6w + 86 = 158 and find the number of weeks he has to save money to buy the music system.


A ) 15
B ) 12
C ) 16
D ) 14

Steps to derive

 [Original equation.]
1 6w + 86 = 158

 [Subtract 86 from each side.]
2 6w + 86 - 86 = 158 - 86

 [Simplify.]
3 6w = 72

 [Divide each side by 6.]
4 6w6 = 726

 [Simplify.]
5 w = 12

6 Jason has to save for 12 weeks to buy the music system.



Hence the right answer is Option B

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