SOLUTION: David wants to purchase a new guitar. The cost of a guitar is $299. David has saved $42 for his new purchase. His parents are willing to give him three times what he has saved. On

Algebra ->  Finance -> SOLUTION: David wants to purchase a new guitar. The cost of a guitar is $299. David has saved $42 for his new purchase. His parents are willing to give him three times what he has saved. On       Log On


   

Question 1160502: David wants to purchase a new guitar. The cost of a guitar is $299. David has saved $42 for his new purchase. His parents are willing to give him three times what he has saved. On the weekends, David cuts lawns for $20 an hour. How many more hours will David have to work until he has enough money to purchase his guitar?
Found 2 solutions by ikleyn, josgarithmetic:
Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.

The problem's formulation is FAULT:

it did not say in the condition, how many hours David just worked for $20/hour, before asking "how many more hours . . . "



Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
How many more hours? More than what?

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The cost of a guitar is $299. David has saved $42 for his new purchase. His parents are willing to give him three times what he has saved. On the weekends, David cuts lawns for $20 an hour. How many cross%28more%29 hours will David have to work until he has enough money to purchase his guitar?
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x hours to work at $20 per hour
42%2B3%2A42%2B20x=299
20x=299-4%2A42
x=6.55hours
Or close enough to 6%261%2F2hours


( 6 hours 33 minutes )