Mei Yangyang reads a storybook, 9 pages a day, and finishes it in 4 days. If she reads 6 pages a day, how many days can she finish it?
美羊羊读一本故事书，每天读9页，4天读完，如果每天读6页，几天可以读完？
<gadget id="calculator">4 / 6</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">9 * (2/3)</gadget>
<output>6</output>

<result>6</result>