Question

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 1

A=1000 so now the equation is

700(1000)+1200R=1,000,000
700,000+1200R=1,000,000
subtract 7000,000 to get:1200R=300,000

then divide by 1200 to get R=250

Answer 2

700A + 1200R = 1,000,000
700(1000) + 1200R = 1,000,000
700,000 + 1200R = 1,000,000
1200R = 300,000
R = 250