Final Answer:
The information provided is insufficient to determine the number of votes Maria received as the details of the circle graph illustrating the results are not provided.
Step-by-step explanation:
Without the actual circle graph or specific data representing the results of the singing contest, it is impossible to ascertain the number of votes Maria received. The total number of students who voted, 600, does not provide information about the distribution of votes among the contestants. To determine Maria's vote count, one would need the percentage or fraction of the circle graph corresponding to Maria's performance. Without this data, any attempt to estimate Maria's votes would be speculative and inaccurate.