Mrs. Hilt saw a rollercoaster. 7 students rode the rollercoaster every 5 minutes. How many students rode the rollercoaster in 15 minutes?
<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<result>21</result>