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A father promises to pay his son $5.00 for each correct answer he obtains in his math homework. For each incorrect answer, the son must pay his father $8.00. The boy answered twenty-six math questions.
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A father promises to pay his son $5.00 for each correct answer he obtains in his math homework. For each incorrect answer, the son must pay his father $8.00. The boy answered twenty-six math questions. At the end, no money was exchanged.

User Vikifor
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he got 16 questions right (5x16=80) and 10 wrong (8x10=80) He got paid $80 but also had to pay $80. 
User Zweihander
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