"fashion furniture makes two kinds of chairs; rockers and recliners. two machinges a and b are used. machine a is limited to 20 hours per day. machine b is limited to 15 hours per day. machine a takes two hours to make each rocker and four hours to make each recliner. fashion furniture makes a profit of 12$ on each rocker and $10 on each recliner. how many of each type of chair should they make?"

We're missing constraints for machine b.