Question

Of the the 20 girls in a form,16 plays hockey12 plays tennis and 4 plays basket ball .every girl plays atleast one game and two plays all the three .how many plays two and only two games

Answer 1

If x play exactly two games, then
16+12+4 - x + 2 = 20
x = 14

Answer 2

How ,,2 play all games so they must be substracted ,,to say 14 +10+2-X+2=20