###Human: Ignatius owns 4 bicycles.  A friend of his owns different types of cycles, which have three times are many tires as Ignatius's bikes have. He has one unicycle, a tricycle, and the rest are bikes. How many bicycles does the friend own?, ### Assistant: Ignatius has 8 tires because 2 x 4 = 8
His friend has 24 tires because 3 x 8 = 24
There are 20 bicycle wheels because 24-1-3 = 20
He has 10 bicycles because 20 / 2 = 10 
 So the answer is :  10