Question
PSLE
The graph shows the number of stereo systems sold from April to August. The number of stereo systems sold in May is equal to the average number of stereo systems sold from May, June, July and August. Find the number of stereo systems sold in April.

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PSLE
The graph shows the number of stereo systems sold from April to August. The number of stereo systems sold in May is equal to the average number of stereo systems sold from May, June, July and August. Find the number of stereo systems sold in April.