The school holds a large-scale group gymnastics performance. There are 40 people in each class. The 4 classes of the third grade stand in 8 rows. How many people are there on average in each row?
学校举行大型团体操表演，每个班有40人，三年级4个班站成8行，平均每行有多少人？
<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 * (1/2)</gadget>
<output>20</output>

<result>20</result>