The engineering team has been repairing a 9.6-kilometer-long canal for 4 days, 0.65 kilometers a day, how many kilometers are left to be repaired?
工程队修一条长9.6千米的水渠，已经修了4天，每天修0.65千米，还剩下多少千米没修？
<gadget id="calculator">0.65 * 4</gadget>
<output>2.6</output>

<gadget id="calculator">9.6 - 2.6</gadget>
<output>7</output>

<result>7</result>