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Sagot :
18.92 pounds of peanut and 25.08 pounds of nut shack should be used to make the mixture
Explanation:the cost per pound for the nut shack = $6.80
let the amount of pounds of nut shack used in the mixture = n
the cost per pound for the peanuts = $4.80
let the amount of pounds for the peanuts used in the mixture = p
We want to obtain 44 pounds of mixture which sells for $5.94 per pound
sum of pounds mixture = 44
amount of pounds of nut shack used in the mixture + amount of pounds for the peanuts used in the mixture = 44
[tex]n+p=44\text{ }....\mleft(1\mright)[/tex]cost per pound for the nut shack (amount used) + cost per pound for the peanuts (amount used) = cost per pound of the mixture (amount of mixture)
6.80(n) + 4.80(p) = 5.94(44)
[tex]6.8n+4.8p=261.36\text{ }\ldots\mleft(2\mright)[/tex]using substitution method:
from equation 1, we can make n the subject of formula
n = 44 - p
substitute for n in equation (2):
[tex]\begin{gathered} 6.8(44\text{ - p) + 4.8p = 261.36} \\ 299.2\text{ - 6.8p + 4.8p = 261.3}6 \\ 299.2\text{ - 2p = 261.3}6 \end{gathered}[/tex][tex]\begin{gathered} collect\text{ like terms:} \\ 299.2\text{ - 261.36 - 2p = 0} \\ \text{add 2p to both sides:} \\ 37.84\text{ = 2p} \\ \text{divide both sides by 2:} \\ \frac{37.84}{2}\text{ = p} \\ p\text{ = 18.9}2 \end{gathered}[/tex]substitute for p in equation 1:
[tex]\begin{gathered} n\text{ + 18.92 = 44} \\ n\text{ = 44 - 18.9}2 \\ n\text{ = 25.0}8 \end{gathered}[/tex]18.92 pounds of peanut and 25.08 pounds of nut shack should be used to make the mixture
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