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?

Correct answer:

a₁ =  15
a₂ =  5
a₃ =  3
a₄ =  1

Step-by-step explanation:

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