You can, for example never foretell what any one man will do, but you can say with precision what an average number will be up to!
There are six categories : BE BM BEM GE GM GEM
Given:
BE + BEM = 25
GM + GEM = 28
GE = 20
BM = 30
GEM = 3
To find: BE + BEM + BM + GM + GEM + GE
= 25 + 30 + 28 + 20
= 103
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