The school rented 9 buses for the spring outing. Each bus has 70 seats, but there are 4 empty seats. How many people went for the spring outing? ?
学校租了9辆客车去春游，每辆客车有70个座位，结果有4个空位，去春游的共有多少个人？？
<gadget id="calculator">70 * 9</gadget>
<output>630</output>

<gadget id="calculator">630 - 4</gadget>
<output>626</output>

<result>626</result>