400 Young Pioneers took 10 buses to go on an autumn outing. The first 9 buses each carried 43 people. How many classmates did the last bus take?
400名少先队员乘坐10辆大客车去秋游，前9辆车每辆乘坐43人，最后一辆车要坐多少个同学？
<gadget id="calculator">43 * 9</gadget>
<output>387</output>

<gadget id="calculator">400 - 387</gadget>
<output>13</output>

<result>13</result>