How will you measure 5 liters
You are given four different jars of 2 liters, 4 liters, 6 liters and 8 liters respectively with an unlimited water supply. Then you are asked to measure exactly 5 liters of water using them.
How will you do it?
– Fill completely the 4-liter jar,
– Empty it in the 6-liter jar.
– Now again fill it, we have now 4-liter in each.
– Empty these jar at the same rate into the 2-liter jar, this way there will be 1-liter deducted from each of them.
– These jars now have 3-liter each…empty it in 8-liter jar and add the 2liter liquid.
Sums to 5-liter.
‘Empty these jar at the same rate into the 2-liter jar’
……
But how will you ensure that the emptying is done at ‘same rate’? Even the slightest rate variation, say, 1 ml per sec., will cause difference in quantities in the jars, and you will not get “exactly 5 liters” as required.
Also, with this approach you don’t even need the 8-liter jar:
1. Fill both 4 and 6-liter jars
2. Empty them both at a same rate into the 2-liter jar
Your 6-liter jar will have 5 liters.
Wrong solution
It’s impossible since all these jugs have even capacities and no matter on what order you add or subtract even numbers,its not possible to get an odd number(5)
I dont think it can be solved as 5 is a odd number and all the given jars are even number. Any + or – between two even numbers produces only even so it cant be solved.
Source:- Four different jars of 2, 4,6 liters
Your Answer
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