A school went on a spring outing. If each car seats 35 people, 20 people cannot get on the car; if each car seats 40 people, one car can be used less. How many people from this school went to the spring outing?
某学校去春游．如果每车坐35人，就有20人不能上车；如果每车坐40人，则可以少用1辆车．这所学校共有多少人去春游？
<gadget id="calculator">40 * 1</gadget>
<output>40</output>

<gadget id="calculator">20 + 40</gadget>
<output>60</output>

<gadget id="calculator">40 - 35</gadget>
<output>5</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<gadget id="calculator">12 * 35</gadget>
<output>420</output>

<gadget id="calculator">420 + 20</gadget>
<output>440</output>

<result>440</result>