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

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