15) D

Let total number of votes = V
Ann received = ⅓V
Paul received = 116 votes
Elaine received = 116 ÷ 2 = 58 votes

We can form the equation:

116 + 58 + ⅓V = V
174 = ⅔V
V = (174 x 3) ÷ 2 = 261 votes

Ann received = ⅓ x 261 = 87 votes

So Paul won, Ann came second and Elaine came third
Paul won by = 116 – 87 = 29 votes

D is the answer.

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