Milkman milk measuring puzzle

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A milkman carries a full 12 liter container of milk. He needs to deliver exactly 6 liters to a customer who only has 8-liter and a 5-liter containers.

How can he do this ?milk measuring puzzle

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  • 3 Answer(s)
    Best answer

    1)fill 5 liter cup and then pour those five liters into 8 liter cup and again fill 5 liter cup
    We have
    12 lt jar having 2liters milk,
    8 lt jar having 5 liter and
    5 lt jar having 5 liter

    2) Then pour 5liters milk into 8 lt jar so that 2lts left in 5 lt jar
    now
    12 lt jar have 2 lt  milk
    8lt jar  have 8 lts milk and
    5lt jar have 2 lts milk

    3) Then pour 2 lts milk of 5 liter jar into 12liter jar and pour 8 liters into 5 lts  so that 3 liter left in 8 liter jar
    now
    12 lt jar have 4 lt milk and
    8 lt jar have 3 lt milk and
    5 lt jar have 5 lt milk

    4) Pour 5lit into 12 liters so totally 9 liters left in 12 lt jar
    now,
    12 lt jar have 9 lt milk and
    8 lt jar have 3ltr milk  and
    5 lt jar have 0ltr milk

    5) Pour 3ltr milk of 8 lt jar into 5jar and pour 9liter of 12 jar into 8 so that 1 liter left
    12lt jar have 1 lt milk and
    8 lt jar have 8lt milk  and
    5 lt jar have 3lt milk

    6) Pour 2lt milk from 8Lt jar into 5lt jar to fill it completely
    Finally,
    12 lt jar have 1 lt milk and
    8 liters jar have 6 liters of milk and
    5 lt jar have 5 lt milk

    So, we got 6 liters milk

    srivani Scholar Answered on 7th September 2016.
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    The result of Step 4 in the answer given by Srivani can be reached easier, in 3 simple steps, as follows:

    Initially, the entire milk is in 12 Ltr jar. 

    Step 1: Fill the 8 Ltr jar. => 12 Ltr Jar has 4 ltr. left, and 8 Ltr Jar has 8 Ltrs.
    Step 2: Fill the 5 Ltr. jar from the 8 Ltr. jar.  => 12 Ltr Jar has 4 ltr. as before, 8 Ltr jar has 3 Ltr. left, and 5 Ltr jar has 5 ltrs.
    Step 3: Empty the 5 Ltr jar into the 12 Ltr jar to get the same postion as Step 4.

    Rest of the moves as given in the answer.

    Viji_Pinarayi Expert Answered on 7th September 2016.
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    Pour half of the 12 L jar into the 8 L jar until the level in the 12 L jar and 8 L jar are equal. Done.

    sleepygeak Starter Answered on 19th November 2016.
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