Students in two classes in the sixth grade collected tree species. The first class had 45 students, each of whom collected 0.13 kg, and the second class of 36 students each collected 0.17 kg. How many kg did the two classes collect in total?
六年级两个班的学生采集树种，一班45人，每人采集了0.13千克，二班36人每人采集0.17千克，两个班一共采集多少千克？
<gadget id="calculator">0.13 * 45</gadget>
<output>5.85</output>

<gadget id="calculator">0.17 * 36</gadget>
<output>6.12</output>

<gadget id="calculator">5.85 + 6.12</gadget>
<output>11.97</output>

<result>11.97</result>