Master Zhang makes parts, if he makes 6 parts a day, it will be completed in 6 days. If you do 9 a day, how many days can it be done?
张师傅做零件，如果每天做6个，6天完成．如果每天做9个，几天可以完成？
<gadget id="calculator">6 / 9</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6 * (2/3)</gadget>
<output>4</output>

<result>4</result>