There are 3 classes in the third grade with an average of 50 students in each class. There are 48 people in the first class, 53 people in the second class, and how many people are in the third class.
三年级3个班平均每班有学生50人．其中一班有48人，二班有53人，三班有多少人．
<gadget id="calculator">50 * 3</gadget>
<output>150</output>

<gadget id="calculator">48 + 53</gadget>
<output>101</output>

<gadget id="calculator">150 - 101</gadget>
<output>49</output>

<result>49</result>