A, B, and C are running a 100-meter race. When A finishes running, B is still 20 meters away from the finish line, and C is still 40 meters away from the finish line. When B finishes running, how many meters away is C from the finish line?
甲、乙、丙三人进行100米竟赛，甲跑完时，乙离终点还有20米，丙离终点还有40米，当乙跑完时，丙离终点还有多少米？
<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<gadget id="calculator">25 * 3</gadget>
<output>75</output>

<gadget id="calculator">100 - 75</gadget>
<output>25</output>

<result>25</result>