The ratio of work efficiency between master and apprentice is 4:3. How many days will it take for the apprentice to complete the work completed by the master in 12 days?
师徒2人工作效率的比是4：3，师傅12天完成的工作由徒弟做要用多少天．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / (3/4)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">12 * (4/3)</gadget>
<output>16</output>

<result>16</result>