The fourth and fifth grade students collected a total of 34.7 kilograms of tree species, of which the fourth grade students collected 15.43 kilograms. How many kilograms of tree species were collected less in the fourth grade than in the fifth grade?
四、五年级的学生共采集树种34.7千克，其中四年级学生采集了15.43千克，四年级比五年级少采集树种多少千克？
<gadget id="calculator">34.7 - 15.43 - 15.43</gadget>
<output>3.84</output>

<result>3.84</result>