Carol gets a fixed $20 allowance each week. She can also earn $1.5 more dollars each week if she does extra chores. At the end of 10 weeks, she has 425 dollars. How many extra chores did she average each week?
Thoughts? Step-by-step reasoning:
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She earned $42.5 on average per week because 425 / 10 = 42.5. She earned $22.5 each week from extra chores because 42.5 - 20 = 22.5. She did 15 extra chores a week because 22.5 / 1.5 = 15.
Thus, the answer is 15.
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