The master worker makes 12 parts per hour, and can complete them all in 7 hours. If you want to complete them in 3 hours, how many parts do you need to make per hour?
工人师傅每小时做12个零件，7小时可以全部完成，如果想3小时完成，需要每小时做多少个？
<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">12 * (7/3)</gadget>
<output>28</output>

<result>28</result>