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

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