There are 150 workers in the first workshop of a garment factory, divided into three groups. The number of people in the first group accounts for (2/5) of the total number of people in the workshop, and the number of people in the second group accounts for the rest (4/9). How many people are in the third group?
某服装厂第一车间有工人150人，分成三组．第一组的人数占车间总人数的(2/5)，第二组的人数占余下的(4/9)．第三组有多少人？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">150 * (2/5)</gadget>
<output>60</output>

<gadget id="calculator">150 - 60</gadget>
<output>90</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">90 * (4/9)</gadget>
<output>40</output>

<gadget id="calculator">150 - 60 - 40</gadget>
<output>50</output>

<result>50</result>