A convoy slowly crosses a 298-meter-long bridge at a speed of 4 m/s and takes 115 seconds. It is known that each vehicle is 6 meters long and the distance between two adjacent vehicles is 20 meters. How many vehicles are there in the convoy?
一个车队以4米/秒的速度缓慢通过一座长298米的大桥，共用115秒，已知每辆车长6米，相临两车间隔20米，则这个车队一共有多少辆车．
<gadget id="calculator">115 * 4</gadget>
<output>460</output>

<gadget id="calculator">460 - 298 - 6</gadget>
<output>156</output>

<gadget id="calculator">20 + 6</gadget>
<output>26</output>

<gadget id="calculator">156 / 26</gadget>
<output>6</output>

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

<result>7</result>