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

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