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13.07.2020 •
Mathematics
20. There were sold 200 books and magazines. Ono book costs $15 and oach magazino costs $5: they spent $1500 in total. How many books and how many magazines wero sold?
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Ответ:
Books = 50
Magazines = 150
Step-by-step explanation:
b + m = 200
b = 200 - m(1)
15b + 5m = 1500
Substituting,
15(200-m) + 5m = 1500
3000 - 15m + 5m = 1500
-10m = 1500 - 3000
m = 1500 / 10 = 150
b = 200 - 150 = 50
Ответ:
4x^2+726x-2869.33
Step-by-step explanation:
I looked it up
enjoy!