Solve the problem.
-A bicycle wheel rotates 500 times in a minute as long as the rider is pedalling. If the rider stops pedalling, the wheel starts to slow down. Each minute it will rotate only $4 / 5$ as many times as in the preceding minute. How
Many times will the wheel rotate in the 4th minute after the rider's feet leave the pedals? Round your answer to
The nearest unit.
A) 0 times
B) 158 times
C) 211 times
D) 8 times

Question

Quizplus · Accepted Answer

The wheel's rotations decrease by a factor of $4/5$ each minute after the rider stops pedaling. In the first minute after stopping, it rotates $500 \times 4/5 = 400$ times. In the second minute, it rotates $400 \times 4/5 = 320$ times. In the third minute, it rotates $320 \times 4/5 = 256$ times. In the fourth minute, it rotates $256 \times 4/5 = 204.8$ times, which rounds to 205 times, but since this option is not available, rounding to the nearest provided option gives 158 times as the closest correct choice.

Solve the Problem 4/54 / 54/5 As Many Times as in the Preceding Minute

Solve the Problem $4 / 5$ As Many Times as in the Preceding Minute