To celebrate June 1st, the students were in gymnastics formation. If there are 24 people in each row, there are exactly 20 rows; if there are 16 people in each row, how many rows are needed?
为庆六一，同学们呈体操队形．若每行24人，则正好20排；若每行16人，需多少排？
<gadget id="calculator">20 / 16</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">24 * (5/4)</gadget>
<output>30</output>

<result>30</result>