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how many pounds of coffee worth 10 dollars a pound should be added to 20 pounds of coffee worth 4 dollars  a pound to get a mixture worth 5 dollars a pound

 
 Feb 23, 2021
 #1
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10x + 4*20 = 5(20 +x)

 

10x + 80  = 100  + 5x

 

10x - 5x    = 100  -  80

 

5x  =   20

 

x = 20 / 5 =    4 lbs

 

 

cool cool cool

 
 Feb 23, 2021

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