To build a 450-meter-long canal, start to build 32.4 meters per day. After 5 days of repairing, the rest will be completed within 4 days. How many meters should be repaired per day?
修一条长450米的水渠，开始每天修32.4米，修了5天后，余下的要在4天内修完，每天应修多少米？
<gadget id="calculator">32.4 * 5</gadget>
<output>162</output>

<gadget id="calculator">450 - 162</gadget>
<output>288</output>

<gadget id="calculator">288 / 4</gadget>
<output>72</output>

<result>72</result>