Question 283890
Brianna has 2 pounds of brand 176 nuts that sell for $3 a pound. She also has brand 391 nuts that sell for $1.74 a pound. If she wants a mixture of nuts that sell for $2.58 a pound, how many pounds of brand 391 should she add? 

How do you come to that conclusion? 
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B1 costs 300/pound
B3 costs 174/pound
She has 2 pounds of B1
x = pounds of B3 to add
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The cost of the mix is:
B1*300 + x*174
The amount of the mix is B1 + x
and the cost of the mix is (B1 + x)*258
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There are 2 equations for the price of the mix, and they're equal
B1*300 + x*174 = (B1 + x)*258
B1 is 2
600 + 174x = 516 + 258x
x = 1 pound
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