Phantom voters, only Mr. x people. Voters said. A single person y ข.The number of voters all 100 people.Therefore, X + y + 20 + 13 + 12 + 15 + 9 = 100 people.X + y = 31 ..... man (1)
Let the voters Mr. Only x people who voted Mr. B. Only y the number of votes of the 100 people so x + y + 20 + 13 + 12 + 15 + 9 = 100 to x + y =. 31 people ..... (1)