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The cost of coffee is determined by the type of coffee beans that are mixed together. The cost of a local mix of Arabica and Robusta beans is modeled by the equation below, where A = the pounds of Arabica and R = pounds of Robusta: 700A + 1200R = 1,000,000 If a mixture contains 1000 pounds of Arabica beans, how many pounds of Robusta beans should be in the mixture? R = ________________ pounds Numerical Answers Expected! Answer for Blank 1:

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choixongdong
 A = the pounds of Arabica and R = pounds of Robusta
 700A + 1200R = 1,000,000
If a mixture contains 1000 pounds of Arabica beans
so
700A + 1200R = 1,000,000
700(1000) + 1200R = 1,000,000
700,000 + 1200R = 1,000,000
1200R = 1,000,000 - 700,000
1200R = 300,000
        R = 250
answer
R = 250 pounds

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