It took three weeks to dig a 12.5-meter-long canal. In the first week, 3.75 meters were dug, which was 0.68 meters less than in the second week. How many meters were dug in the third week?
用三周的时间挖一条长12.5米的水渠，第一周挖了3.75米，比第二周少挖了0.68米，第三周挖了多少米？
<gadget id="calculator">3.75 + 0.68</gadget>
<output>4.43</output>

<gadget id="calculator">12.5 - 3.75 - 4.43</gadget>
<output>4.32</output>

<result>4.32</result>