There are three vessels 'Y' 'Z' and 'T' such that each contain a mixture of honey and water in the ratio of 7 : 3, 3 : 2 and 5 : 3 respectively. If (x + 20) ml, (x-30) ml and 2x ml mixture from 'Y', 'Z' and 'T' is mixed and the ratio of honey to water in the resultant mixture becomes 20 : 11 respectively then find the value of '2.5X'?