Question
PSLE
The graph shows the number of projectors sold from September to December. The number of projectors sold in December is equal to the average number of projectors sold from September to November. Find the number of projectors sold in December.

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PSLE
The graph shows the number of projectors sold from September to December. The number of projectors sold in December is equal to the average number of projectors sold from September to November. Find the number of projectors sold in December.