Problem Solving

Last year, all registered voters in Kumannia voted either for the Revolutionary Party or for
the Status Quo Party. This year, the number of Revolutionary voters increased 10%, while
the number of Status Quo voters increased 5%. No other votes were cast. If the number of
total voters increased 8%, what fraction of voters voted Revolutionary this year?

when i solve this by allegation or weighted average i get a clean solotion :

1.1x + 1.05y = 1.08(x+y)

x/y = 3/2.

hence answer x = 60%.

MGMAT has given a long soln and oa is 11/18 = [spoiler]61.1%[/spoiler]


I am sure I am missing something.