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

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