Sales of products

For 80 pieces of two quality products a total sales is 175 Eur. If the first quality product was sold for n EUR per piece (n natural number) and the second quality product after 2 EUR per piece. How many pieces of the first quality were sold?


a1 =  15
a2 =  5
a3 =  3
a4 =  1


Solution in text a1 =
Solution in text a2 =
Solution in text a3 =
Solution in text a4 =

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