To build a canal with a length of 100.5 meters, 45.8 meters have been repaired, how many meters are left to be repaired?
修一条长为100.5米的水渠，已经修好了45.8米，还剩多少米没修？
<gadget id="calculator">100.5 - 45.8</gadget>
<output>54.7</output>

<result>54.7</result>