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?
Ignatius has 8 tires because 2 x 4 = 
<gadget id="calculator">2*4</gadget>
<output>8</output>
8.
His friend has 24 tires because 3 x 8 = 
<gadget id="calculator">3*8</gadget>
<output>24</output>
24.
There are 20 bicycle wheels because 24-1-3 = 
<gadget id="calculator">24-1-3</gadget>
<output>20</output>
20.
He has 10 bicycles because 20 / 2 = 
<gadget id="calculator">20/2</gadget>
<output>10</output>
10.

<result>10</result>