The road construction team built a 78-kilometer road in three months, 23.5 kilometers in the first month, and 0.25 kilometers more in the second month than in the first month. How many kilometers were repaired in the third month?
筑路队用三个月修了一条78千米的路，第一个月修了23.5千米，第二个月比第一个月多修了0.25千米，第三个月修了多少千米？
<gadget id="calculator">23.5 + 0.25</gadget>
<output>23.75</output>

<gadget id="calculator">78 - 23.5 - 23.75</gadget>
<output>30.75</output>

<result>30.75</result>