Well there's no expressions to list, but:
First you have 33 students, 11 voted for Candidate A, 15 voted for Candidate B, the remaining 7 didn't vote for either.
We're looking for the percentage for Candidate A, being: 11/33 which can be reduced down to 1/3rds, 1/3rds is equivalent to 0.333... which in reference if multiplied by 100 gives you 33.3% (estimated).
So your answer should be that 33.3% of the class voted for Candidate A.
Hope that helps. ^ ^
{-Ghostgate-}
