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Sagot :
1) Gathering the data
A =$4.25
B =$5.40
160 lb
Total Costa: $ 765.10
2) In this question, we can set a pair of Linear equations and then solve it to get how many pounds for A, and B. So we can write out:
4.25a +5.40b =765.10 This equation relates the cost
a + b = 160 And this one relates the quantity
We can solve this using the Elimination Method, multiplying the whole 2nd equation by -5.40 to add them and eliminate b:
4.25a + 5.40b = 765.10
a + b = 160 x(-5.40)
4.25a + 5.40b = 765.10
-5.4a -5.4b = -864
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-1.15a = -98.9 Divide both sides by -1.15
a = 86
b = 160 -86, b =74
3) Since the question is only about A, then the answer is 86 pounds of coffee
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