Using a 7 litre flask and 11 liter flask measure out 2 liters in the smaller flask.
Don't google
Fill 11 liter flask, pour the 11 liter into 7 liter flask, you will have 4 liter in 11 liter flask, empty the 7 liter flask, then pour the water from 11 liter to 7 liter flask , empty 11 liter flask and fill it again. So you have 4 liter in 7 liter flask and 11 liter in 11 liter flask. After this fill the 7 liter flask from 11 liter flask, this will make the the 11 liter flask to have exactly 8 liters, then you can empty the 7 liter flask and then fill it with 11 liter flask again leaving 1 liter in 11 liter flask, pour the 1 liter into the smaller flask and repeat the procedure again to get 2 liters in the smaller flask.
All right know the big trick
I made it so confusing and ugly :-/
Make the 11 liter flash full of water. Empty in in the 7 flask. Now the 11liter contains 4 liter and the 7 contains 7 liter. Empty the 7 liter and pour the 4 liter into the 7 liter. Now the 11 liter flash it empty and the 7 liter flash contains 4 liters. Pour the 11 liter full of water and pour the 7 liter flash full. Now the 11 contains 8 liter and the 7 liter contains 7 liter. Now empty the 7 liter. Pour the 8 liter into the 7 liter to get 1 liter in the big flash. Meh ishaan beat me to it :/
What's up with the picture, eh?
Then pour the 1 liter in the 7 liter. Now pour the 11 liter full of water and empty it in the 7 liter flash. Now the 7 liter is full and the 11 liter contains 5 liter. Pour out the 7 liter. pour the 5 liter in the 7 liter. now full up the 11 liter and make the 7liter full using the big flask. The 11 liter now contains 9 liter and the 7l is full. empty the 7 liter and fill it up with the big flask. Now the 7 liter is full and the 11 liter contains 2 liter of water. empty the 7 liter and fill it up with the 2 liter of the big flask. Sorry, had to write it our for completeness :)
Wow, the parallelogram thing is super cool...
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