The cost of 3 notebooks and 2 pencils is $5.10. At the same prices, the cost of 2 notebooks and 3 pencils is $4.65. What is the total cost of a 1 notebook and 1 pencil ?
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The cost of 3 notebooks and 2 pencils is $5.10. At the same prices, the cost of 2 notebooks and 3 pencils is $4.65. What is the total cost of a 1 notebook and 1 pencil ?
Die Kosten für 3 Notizbücher und 2 Stifte betragen 5,10 USD. Zu den gleichen Preisen kosten 2 Notebooks und 3 Stifte 4,65 USD. Was sind die Gesamtkosten für 1 Notizbuch und 1 Bleistift?
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\(3n+2p=5.10\\ \underline{2n+3p=4.65}\\ 6n+4p=10.20\\ \underline{6n+9p=12.95}\\ 5p=2.75\)
\(p=0.55\)
\(3n+1.10=5.10\\ 3n=4.00\)
\(n=1.3\overline3\)
The total cost of 1 notebook and 1 pencil is $0.55 + $1.33= $1.88.
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