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

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