Question

There are three cans. One of them holds exactly
10 litres of milk and is full. The other two cans can hold 7 litres and 3
litres respectively. There is no graduation mark on the cans. A customer
asks for 5 litres of milk. How would you give him the amount he ask? He
would not be satisfied by eye estimates.
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Answer 1

Answer:

The Ans is 5

Step-by-step explanation:

So the first step is the man takes an empty vessel.

He takes out 9 litres of milk from 10 litre can using 3 litre can and then he pour this to the empty vessel. Now only one litre of milk remain in the 10 litre can. Using 7 litre can he takes out 7 litre of milk from the vessel and he pours it to the 10 litre can.

Now the ten litre can will have 1+7=8 litres of milk.

Again using 3 litre can he takes out 3 litres of milk from the 10 litre can...

Then the 10 litre can will have now 8-3=5 litres of milk

Thus proved