Uncle Wang processes a batch of parts, 4 parts per day, which can be completed in 9 days. If it takes 6 days to complete, how many parts does Uncle Wang need to process every day?
王叔叔加工一批零件，每天加工4个，9天可以完成．如果要6天完成，王叔叔每天需要加工多少个零件？
<gadget id="calculator">9 / 6</gadget>
<output>3/2 = around 1.5</output>

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

<result>6</result>