Question
A stationery kiosk sells notebooks in packs of 4 and 7. At first, there were 4 times as many packs of 4 as packs of 7. After selling half of the packs of 4 and some packs of 7, Mr Cheong packs 17 additional packs of 7. How many packs of 4 are sold if there are 8 times as many packs of 4 as packs of 7 and there is a total of 351 unsold notebooks?
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A stationery kiosk sells notebooks in packs of 4 and 7. At first, there were 4 times as many packs of 4 as packs of 7. After selling half of the packs of 4 and some packs of 7, Mr Cheong packs 17 additional packs of 7. How many packs of 4 are sold if there are 8 times as many packs of 4 as packs of 7 and there is a total of 351 unsold notebooks?