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[[folder:Real Life]]
* The famous canal in UsefulNotes/{{Panama}}, which allows a cargo ship to move between the Pacific and Atlantic Oceans without needing to circumnavigate South America, employs a very complex procedure of drowning and filling various river segments so the ships can travel across them. This is because the innermost segments are at higher levels above the sea, so for each ship that traverses the whole path the respective water levels of the segments have to be adjusted back to back.
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* In one episode of ''WesternAnimation/{{Cyberchase}}'', the kids and Digit have to input exactly one cup of sand into a device to open a castle gate. Digit has a 2-cup and 3-cup measure, but is missing his 1-cup measure. At first they try filling the 2-cup halfway, but are unable to get it precise enough. Then they figure out they can fill the 3-cup measure, pour enough sand from it to fill the 2-cup, and be left with exactly one cup.
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* ''WesternAnimation/{{Cyberchase}}'': In one episode of ''WesternAnimation/{{Cyberchase}}'', "The Wedding Scammer", the kids and Digit have to input exactly one cup of sand into a device to open a castle gate. Digit has a 2-cup and 3-cup measure, but is missing his 1-cup measure. At first they try filling the 2-cup halfway, but are unable to get it precise enough. Then they figure out they can fill the 3-cup measure, pour enough sand from it to fill the 2-cup, and be left with exactly one cup.
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-->'''Higgins''': "You need three pints of water. How do you measure three pints using only a five pint can and a two pint can?" What do I want three pints of water for?
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Not necessarily related to SolveTheSoupCans.
Nothing to do with TwoPlusTortureEqualsFive.
Nothing to do with TwoPlusTortureEqualsFive.
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See TwelveCoinsPuzzle for another puzzle requiring math calculations on the spot; in this case, to find out the one odd-weighted coin among many. Not necessarily related to SolveTheSoupCans.
SolveTheSoupCans. Nothing to do with TwoPlusTortureEqualsFive.
TwoPlusTortureEqualsFive.
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%%* ''TabletopGame/PerplexCity'' used this one on a card.
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%%* ''TabletopGame/PerplexCity'' ''ARG/PerplexCity'' used this one on a card.
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* In ''VideoGame/KnightsOfTheOldRepublic'' on Manaan, this puzzle appears in the form of pressurized doors, where you must transfer water back and forth between a series of rooms until the left-side passage is open and you can go through. Solving it is a prerequisite for the "good" ending on that planet.
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* In ''VideoGame/KnightsOfTheOldRepublic'' on Manaan, this puzzle appears in the form of pressurized doors, canisters that control the Kolto harvester, where you must transfer water the fuel for the machinery back and forth between a series of rooms until you have four units in the left-side passage is open and you can go through.large tank which will destroy the machine. Solving it is a prerequisite for the "good" ending on that planet.
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* In the ''Series/MurdochMysteries'' episode "Breaking Ranks", a subplot has Julia giving the constables an IQ test devised by a friend of hers. The first question is a variant of the puzzle. Higgins [[ComicallyMissingThePoint misses the point]]:
-->'''Higgins''': "You need three pints of water. How do you measure three pints using only a five pint can and a two pint can?" What do I want three pints of water for?
-->'''Higgins''': "You need three pints of water. How do you measure three pints using only a five pint can and a two pint can?" What do I want three pints of water for?
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Nothing to do with TwoPlusTortureEqualsFive.
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* ''[[VideoGame/DrBrain The Castle of Dr. Brain]]'' has a form of this with its hourglass puzzle. Measure 40 seconds with a 25 and 15-second hourglass.
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* ''[[VideoGame/DrBrain The Castle of Dr. Brain]]'' has a form of this with its hourglass puzzle. Measure 40 seconds with a by flipping 2 hourglasses that last 35 and 15 seconds (or 25 and 15-second hourglass.15 on easy difficulty).
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safecracker
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* In the 2006 spiritual successor of ''VideoGame/SafeCracker'', this must be done to turn on the fountain in Duncan W. Adams' mansion, by rerouting water between three pistons.
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* In ''Film/FermatsRoom'', there's a variant with two hourglasses: one of four minutes and one of seven minutes, and the goal is to time nine minutes.
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* In ''Film/FermatsRoom'', there's a variant with two hourglasses: one of four minutes and one of seven minutes, and the goal is to time nine minutes. [[spoiler:Answer is to start both hourglasses at once (t=0), turn the four-minute one over once it runs out (t=4), then once the seven-minute one runs out (t=7) start counting -- there's one minute of sand left in the smaller one at that point, then just flip it two more times to get the other eight minutes needed.]]
