Two jars made of very fine glass are shown in the
illustration. They both have the same capacity–6L. Each jar is of the
round profile, but since they are also of the same capacity, the left
jar with the smaller profile is higher – 9 units, while the right jar
with the bigger profile is lower–only 4 units high.
Having an immense supply of water the object is to measure 4L of water
with the help of these jars.