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

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