A total of 406 teachers and students from the school went to the Shanghai Wild Animal Park for a spring outing. Except for 28 people in one tourist bus, there were 42 people in each tourist bus (except the driver). Please do the math, how many coaches were used for this spring outing?
全校师生共406人去上海野生动物园春游，除了一辆旅游车上只乘坐了28人，其余每辆旅游车上都坐了42人(司机除外)．请你算一算，这次春游一共用了几辆旅游车？
<gadget id="calculator">406 - 28</gadget>
<output>378</output>

<gadget id="calculator">378 / 42</gadget>
<output>9</output>

<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<result>10</result>