Earl E. Byrd is selling boxes of cookies for a fundraiser. He gets to keep $5 for every box he sells. A one time fundraising fee of $12 is taken from his earnings. He needs to earn at least $153 to go on the field trip to San Antonio. How many boxes does Earl need to sell to go on the trip?

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Answer:

if each box is $17 but he keeps 5 of it, that means he needs to sell 31 boxes