In this problem, you have to measure full. The same problem can be done with 8litres, 5 litres and 3 litres aslo. Very interesting common sense puzzle. No maths knowledge is needed. In Step 1, you empty 7 litre container and pour it into 19 litre container.& litre will become empty. In the next step, you take 13 litre container which is full, and go on adding into 19 litre container. Since it has already 7 litres, it will be full ,that is after adding 12 litres and 1 litre will remain in 13l vessel. You go on transferring until you have 17 litres in 19 litre container and 3 litres in 13 litre container. At this time 7 litre container is empty. From out of 17 litres you fill the 7 litre container. Now 19 litre container has 10 litres,If you empty the 7 litre container into 13 litre container which already has 3 litres in it, now 13 litre container also will have 10 litres. This problem will improve shrewdness. Jayasala 42 19 li 13 li 7li 0 13 7(-7) step1 7 (+12) 13 (-12) 0 step2 19 (-7) 1 0(+7) step3 12 1 (+7) 7(-7) step4 12(-7) 8 0 (+7) step5 5 8(+5) 7 (-5) step6 5 (+13) 13 (-13) 2 step7 18 0 (+2) 2(-2) step8 18 (-7) 2 0(+7) step9 11 2 (+7) 7(-7) step10 11(-7) 9 0(+7) step11 4 9 (+4) 7(-4) step12 4(+13) 13 (-13) 3 step13 17 0 (+3) 3(-3 step14 17(-7) 3 0(+7) step15 10 3 (+7) 7(-7) Final 10 10 0
