Amountain bike tire completes 20 revoultions and travels 136 feet. round to the nearest inch, what is the diameter of the bikes tire? use 3.14 for pi

To the nearest inch, the diameter of the tire is 26 inches.

The bike traveled 136 feet in 20 revolutions.  First we want to convert this to inches.  

136 ft * 12 in/ft = 1632 inches.

Next we find how many inches it travels in 1 revolution:
1632/20 = 81.6 inches

The distance around the tire is called the circumference, and the formula for circumference is 
C=πd

Our circumference is 81.6 and π is 3.14:
81.6 = 3.14d

Divide both sides by 3.14:
81.6/3.14 = 3.14d/3.14
26 = d

Letter a i would say

If your asking how much altogether for 12 performance the answer will be 98,496.