Three vessels whose capacities are 3 : 2 : 1
are completely filled with milk mixed with
water. The ratio of milk and water in the
mixture of vessels are 5 : 2, 4 : 1 and 4 : 1
respectively. Taking $1\over3$rd of first,
$1\over7$th of third mixtures, a new
mixture kept in a new vessel is prepared.
The percentage of water in the new mixture