a tire dealer sells 2 tires for as much he paid for 3 tires. He paid $240 for a dozen tires. What is the total profit for 12 tires ?

The total profit on 12 tires: 12*10 = $120. Cost per tire: 240/12 = $20. Let P=profit of a single tire. 2(20+P) = 3(20), P = $10.
Updated on Monday, February 06 2012 at 11:15AM EST
Collection: tires