The school has 40 minutes for each class and 10 minutes for rest after class. How many points have you shared from the first class to the end of the third class?
学校每节课时间为40分，下课休息10分，从第一节上课开始到第三节下课，共用了多少分？
<gadget id="calculator">40 + 10</gadget>
<output>50</output>

<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">100 + 40</gadget>
<output>140</output>

<result>140</result>