7 There are two vessels which are filled only with the pure components. Vessel I contains 20 L brandy and vessel II contains 20 L water. From vessel I, 5L brandy is taken and placed in vessel II. Then 4 L mixture is transferred from vessel II to vessel I. Find the ratio of water in vessel I to brandy in vessel II.

(a) 7:8

(b) 8:7

(c) 1:1

(d) 2:1

(e) None of these