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

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