Measure Exact 4litres using 2 jars

If you had an infinite supply of water and a 5 litre and 3 litre jar,
How would you measure exactly 4 Litres of water?

Note- No markings are present on jar


SherlockHolmes Expert Asked on 29th September 2015 in Interview Puzzles.
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  • 3 Answer(s)
    Best answer

    Step 1 : First, fill the 5 liter jug and then pour it into the 3 liter jug. The 5 liter jug now has only 2 liters left.

    Step 2 : Next, empty out the 3 liter jug. Then, pour the 2 liters from the 5 liter jug to the 3 liter jug. So, now the 3 liter jug has 2 liters.

    Step 3 : Fill the 5 liter jug again, and pour 1 liter into the 3 liter jug. Now,  exactly 4 liters is present in 5 liters jar!

    jug1   jug2
    5           3
    5           0  Pour from Jar1 to Jar2
    2           3
    2           0  Empty jar 2
    0           2 Pour from Jar1 to Jar2
    5           2 Pour from Jar1 to Jar2 – Only 1 liter can be poured 
    4           3 ———— 4 Liter —— left in jar1

    Detective Expert Answered on 30th September 2015.
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    Step 1:  Fill the 3 litre jar first and then transfer it to the 5 litre jar
    Step 2:  then again fill the 3 litre jar and fill the remaining 5 litre jar(now 5 l jar is completely filled and you are left with 1 litre in 3 l jar)
    Step 3:empty the 5 l jar and transfer 1 litre from 3l to 5l jar.
    Step 4:fill the 3 litre jar again and transfer it to the 5 litre jar making it 4.

    5      3
    0       0
    0       3
    3       3
    5       1
    1        3
    4        0

    james Starter Answered on 20th October 2015.
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    if the jar top to bottom same size then the answer is

    first fill the water in three litre  jar , and put that water in five litre jar and now   mark the water level , after measuring fill the water full in that five litre jar, after that  the empty three litre jar fill the water since the measurement reach in five litre jar  , so now the water present in the jar 2 liters
    Two times  measure like that got 4 litres

    manoj Starter Answered on 30th September 2015.

    You are saying we have to repeate two times?

    But since we have 2 jars only, so where will you store 2 liters of water after first turn?

    on 30th September 2015.
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