To find out how many votes Mary received, you can multiply the total number of votes by the percentage she received.
Mary received 35% of 1200 votes:
\[ \text{Votes for Mary} = \frac{35}{100} \times 1200 \]
\[ \text{Votes for Mary} = 0.35 \times 1200 = 420 \]
Mary received 420 votes.