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

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