Professor Layton - Puzzle 42 - WTF?

Discussion in 'NDS - Console and Game Discussions' started by dirtycarrot, Feb 18, 2008.

Feb 18, 2008
  1. dirtycarrot
    OP

    Newcomer dirtycarrot Advanced Member

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    I'm having trouble understanding the logic behind this puzzle - even in the hint, it says the camera price is $290, yet the answer for the puzzle is
    95
    This all makes zero sense to me!
     
  2. MaHe

    Member MaHe one lazy schmo

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    Well, I'm talking on top of my head now, but here goes:

    The price of case: x
    The price of camera: x + $300
    The camera price is $300 higher than the price of the case, therefore, altogether: x + x + $300 = $310

    Now, some simple maths:

    2x + $300 = $310
    2x = $310 - $300
    2x = $10 / :2

    x = $5

    The price of the case equals x, therefore it costs five dollars. You paid with a $100 banknote and must receive $95 of change. [​IMG]

    EDIT: I never bought any hints here, so I wouldn't know. But the price of the camera is definitely $305.
     
  3. dib

    Member dib GBAtemp Advanced Maniac

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    Step 1: you know it's not going to be $10, because that would be too easy and then it wouldn't be a puzzle.

    Step 2: Assume that the case were $10. The wording says "the camera costs $300 more than the case itself". So that would make the camera alone $310, so camera + case would be $320.

    Step 3: Since that's clearly too high, your next bet would be to reduce the price of the case as MaHe pointed out. Plug in $5, now the camera becomes $5+$300=$305. Add the case and you've got your $310.

    Step 4: The answer is how much change, so subtract that $5 from $100. Pretty easy overall.
     

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