Posted by Afuape on .
A survey in a class shows that 14 of the student plays football,10 plays handball and 5 play both football and handball . How many student are there in a class if every one plays at least one of this game.

Mathematics 
Reiny,
Number(football OR handball) = Number(football) + number(handball)  number(football AND handball)
= 14+105 = 19
or make a Venn Diagram and fill in the values.