A bicycle tire completes 9/10 of a revolution every 1/3 second. How many revolutions will the tire complete every minute?

Find out how many revolutions it makes in 1 second.

9/10 * 3 = 27/10 = 2.7

Set up a proportion.

There are 60 seconds in a minute.

2.7/1 = x/60

Cross multiply:

x = 2.7 * 60

x = 162

So it will make 162 revolutions a minute.