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slonekaitlyn01
12.08.2020 •
Mathematics
How do you calculate the population mean
Solved
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Ответ:
Ответ:
Let a = rice, b = potatos
20a + 10b = 10.20
30a + 12b = 14.04
I'm going to multiply the first equation by 3 and the second equation by - 2.
60a + 30b = 30.60
- 60a - 24b = 28.08
Notice the a-variables will cancel. Combine like terms and constants and solve for b.
6b = 2.52
b = 0.42
Now we plug in our answer for b and solve for a.
20a + 10(0.42) = 10.20
20a + 4.20 = 10.20
20a = 6
a = 0.30
So 1 lb of rice is 30 cents and 1 lb of potatoes is 42 cents.
Now we do 10a + 50b.
10(0.30) + 50(0.42)
3 + 21
24.
10 lbs of rice and 50 lbs of potatoes would cost $24.