The cost of coffee is determined by the type of coffee beans that are mixed together. The cost of of a local mix of a arabica and robusta beans is modeled by the equation below where a equals 2 pounds of Arabica and R= pounds of Robusta
700A + 1200R =1,000,000
If a mixture contains 1000 pounds of arabica how many pounds of robusta beans should be in the mixture?
R= _______________ pounds
Numerical answer pleasee!