Somewhere on the net, I found an aptitude test by Google. This was the first riddle.

WWWDOT - GOOGLE = DOTCOM

Only available information is E and M can be interchanged. I spent some 10 minutes on this and came up with the answer. Not very difficult but fun to do, a warm-up for the gray matter. :)

I am posting the answer below. But I dont want to spoil the fun for those of you who want to do the warm-up. I am posting it in white. Just select it to see it. :)

The answer is : 777589 - 188103 = 589486