Question
PSLE
The graph shows the number of massage chairs sold from September to December. The number of massage chairs sold in October is equal to the average number of massage chairs sold from September, November and December. Find the number of massage chairs sold in October.

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PSLE
The graph shows the number of massage chairs sold from September to December. The number of massage chairs sold in October is equal to the average number of massage chairs sold from September, November and December. Find the number of massage chairs sold in October.