Answer:
Given:
5 liter Jar
3 liter jar
Unlimited supply of water.
To measure out 4 liters exactly.
Steps to be carries out to measure out 4 liters of water exactly.
Water content: 3 liter jar = Empty , 5 liter jar = Empty
1) Fill the 3 liter jar completely with water.
3 liter jar = 3 liter , 5 liter jar = Empty
2) Empty the filled 3 liter jar of water by pouring it out into 5 liter jar.
Water content: 3 liter jar = Empty , 5 liter jar = 3 liter
3) Again fill the empty 3 liter jar completely.
Water content: 3 liter jar = 3 liter , 5 liter jar = 3 liter
4) Pour water from 3 liter jar into 5 liter jar until it is completely filled.
Water content: 3 liter jar = 1 liter , 5 liter jar = 5 liter
5) Empty the 5 liter jar completely.
Water content: 3 liter jar = 1 liter , 5 liter jar = Empty
6) Empty the 3 liter jar by pouring the water into 5 liter jar.
Water content: 3 liter jar = Empty , 5 liter jar = 1 liter
7) Fill the 3 liter jar completely with water.
Water content: 3 liter jar = 3 liter , 5 liter jar = 1 liter
8) Empty the 3 liter jar by pouring it into 5 liter jar.
Water content: 3 liter jar = Empty , 5 liter jar = 4 liter
Now, we have exactly 4 liters of water in the 5 liter jar.