To make one kind of parts, 8 workers complete 64 parts in 0.5 hours. According to this calculation, how many workers are needed to complete 144 parts in 3 hours?
做一种零件，8个工人0.5小时完成64个，照这样计算，3小时要完成144个零件，需要多少个工人？
<gadget id="calculator">64 / 8 / 0.5</gadget>
<output>16</output>

<gadget id="calculator">16 * 3</gadget>
<output>48</output>

<gadget id="calculator">144 / 48</gadget>
<output>3</output>

<result>3</result>