I need to ask this question on an algebra question. How do I do this word problem? A merchant mixed 8lb of a cinnamon tea with 3lb of spice tea. The 11lb mixture cost $18. A second mixture included 12lb of the cinnamon tea and 13 lb of the spice tea. The 24-pound mixture cost $42. They want me to find the cost per pound of the cinnamon tea and of the spice tea.