In the third grade, 17 boys and 15 girls participated in tree planting. In the fourth grade, the number of participants was twice that of the third grade. In the fifth grade, 192 people participated. How many times as many people plant trees in fifth grade as in fourth grade?
三年级参加植树的男生有17人，女生有15人，四年级参加的人数是三年级的2倍，五年级有192人参加．五年级植树的人数是四年级的几倍？
<gadget id="calculator">17 + 15</gadget>
<output>32</output>

<gadget id="calculator">32 * 2</gadget>
<output>64</output>

<gadget id="calculator">192 / 64</gadget>
<output>3</output>

<result>3</result>