A bundle of wires is 100 meters long, and 29.5 meters remain after being used twice. It is known that 36.8 meters were used for the first time, how many meters are used for the second time?
一捆电线长100米，用去两次后还剩下29.5米，已知第一次用去36.8米，第二次用去多少米？
<gadget id="calculator">100 - 29.5 - 36.8</gadget>
<output>33.7</output>

<result>33.7</result>