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A very old vending machine accepts only nickels (n) and dimes (d). Candy costs up to $0.50, but sometimes the machine will dispense candy without any coins being inserted into the machine. Which inequality shows all of the ways to obtain a candy bar from the machine?

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1 answer
  1. how about

    5n + 10d ≤ 50

    n + 2d ≤ 10 , where n and d are whole numbers

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