Brian's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Brian $4.65 per pound, and type B coffee costs $5.85 per pound. This month's blend used four times as many pounds of type B coffee as type A, for a total cost of $841.50. How many pounds of type A coffee were used?
4.65A + 5.85*4A = 841.50
now just solve for A