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Mathematics, 10.02.2021 20:50 Dweath50

Amanda went to the store to purchase ink pens. She found three kinds of pens. The first cost $4 each; the price of the second kind was 4 for $1; and the cost for the third kind was 2 for $1. She bought 20 pens and she bought at least one of each kind. (It is possible to buy only 1 of the pens that are β€œ4 for $1” or β€œ2 for $1”.) The cost was $20. When she got back to her office, Amanda decided to turn this into a math problem for me. She asked: how many of each kind did I buy?

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Amanda went to the store to purchase ink pens. She found three kinds of pens. The first cost $4 each...
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