Two engineering teams, A and B, repair a road with a length of 9,800 meters. Team A repairs it for 4 days, and repairs 650 meters per day. The rest is left by the cooperation of teams A and B. Team B can repair 550 meters per day. How many days will the road take?
甲、乙两工程队修一条长9800米的路，甲队先修了4天，每天修650米，剩下的由甲、乙两队合作，乙队每天可修550米，那么修完这条路共需几天？
<gadget id="calculator">650 * 4</gadget>
<output>2_600</output>

<gadget id="calculator">9_800 - 2_600</gadget>
<output>7_200</output>

<gadget id="calculator">650 + 550</gadget>
<output>1_200</output>

<gadget id="calculator">7_200 / 1_200</gadget>
<output>6</output>

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<result>10</result>