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17 May, 11:30

John bought z hamburgers at $3 each and paid with a 20 dollar note. How much change did he get?

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  1. 17 May, 11:36
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    He got 20 - 3z change.
  2. 17 May, 11:45
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    20/3 = z

    Now z would equal 6.666 ... but he can't eat a sixth of a burger and only only pay for that part. He would have to eat 5 (not 7) because he cannot afford 6 burgers with a $20 bill
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