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Cecil has a mysterious money machine that will double any amount of money placed in it and add $5.00 to the doubled amount. Yesterday, he placed a certian amount of money in the box, got a new amount, then placed the new amount back in the box. Then he had $51.00. How much money did he first place in the mysterious money machine?

  • math -

    Machine will:

    *double any amount placed inside

    *add $5 to the amount that is doubled

    *a total of $51 was the end result

    Let x = how much money he first placed in the box.

    Let 2x = the double amount

    2x + 5 = 51

    2x = 51 - 5

    2x = 46

    x = 46/2

    x = $23

    Done!

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