Looking for Quicker approach

[jatinet]

There are 5 numbers in set X, which mean is greater than its median. There are 7 numbers in the set Y, which mean is greater than its median also. If Z consists of X and Y, which have no common numbers, is mean of Z greater than its median?
1) Mean of X is less than mean of Y
2) Median of X is less than median of Y
I was able to find the answer but my approach (plugging numbers) took considerable time. Has anyone got quicker approach to such problems. ?
Also, in terms of difficulty level where would you guys put such problem?

[800ForSure]

This problem has been addressed before, I don't have a quick ref but please look for the posts by 'Nuthan'.