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

Answer 1

700/1200 = 1000/x
7/12 = 10/x
7x=120x
x=17.14
We need to multiple this x 100 to get back to where we divided everything by 100 to make the numbers smaller and easier to work with.
R=1714 pounds