Question

If you had a 5-liter bowl and a 3-liter bowl, and an unlimited access to water, how would you measure exactly 4 liters?

Answer 1

...fill the 5L bowl

fill the bowl with 3L. with these 5L.

there is therefore 2L left in the large bowl

we empty the 3L bowl and fill it with the 2L from the large bowl

fill the large 5L bowl.

and we pour it into the 3L one which already contains 2L, so we pour 1L from the 5L bowl into the 3L bowl

So there are 4L left in the big bow

Explanation: