Analysis: Let the number of winning games be x, and the number of playing general games be x/(0.55) = (20x)/11. Because the number of games must be an integer, X is a multiple of 1 1, which means x= 1 1, 2.

Then the number of lost games is (20x)/11-x = (9x)/11,and 2x+[(-2) (9x)]/1=

I don't know if the answer is right, because it is an integer! )

Note: For reference only!