Quick algebra prob?
"orville found that they had 144 pedals in the shop, and wilbur found that they had 186 wheels. all pedals and wheels were actually parts of either bicycles or tricycles. they were about to start over with their inventory when their friend kitty, who was a nice problem solver, challenged them to figure out the number of bicycles and tricycles from the inventory they had already done. can you help the wright brothers? how many bicycles and tricycles did they have in their shop?." (san jose mercury news, april 3, 1995).