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The ratio of the number of pens to the number of pencils in Johnson`s stationery shop was 3 : 7.
The selling price of each pencil was 80 cents.
The selling price of each pen was 70 cents more than each pencil.
$404 could be collected by Johnson if he was able to sell all the pens and pencils in his shop.
After he sold some pencils, he had the same number of pens and pencils left.
How many pencils did he sell?