Team A and Team B jointly dig a canal with a length of 8250 meters, and Team B digs 150 meters more than Team A every day. If it is known that after 4 days of digging by team A, the rest will be dug by the two teams for 7 days, and the task will be completed. So how many meters does Team A dig every day?
甲、乙两队共同挖一条长8250米的水渠，乙队比甲队每天多挖150米．如果已知先由甲队挖4天后，余下的由两队共同挖了7天，便完成了任务．那么甲队每天挖多少米．
<gadget id="calculator">150 * 7</gadget>
<output>1_050</output>

<gadget id="calculator">8_250 - 1_050</gadget>
<output>7_200</output>

<gadget id="calculator">4 + 7 + 7</gadget>
<output>18</output>

<gadget id="calculator">7_200 / 18</gadget>
<output>400</output>

<result>400</result>