740 students from Hongmei Primary School and several teachers took 15 identical buses to go on a spring outing. There are 50 seats in each car, and each seat is full of one person. How many teachers are there to participate in the spring outing?
红梅小学740名学生和几位老师一起乘15辆同样的客车去春游．每辆车有50个座位，每个座位坐1人，正好全部坐满．参加春游的老师有多少位？
<gadget id="calculator">50 * 15</gadget>
<output>750</output>

<gadget id="calculator">750 - 740</gadget>
<output>10</output>

<result>10</result>