The fourth and fifth graders collected tree species. The fifth grade collected 19.4kg, which was 4.5kg less than the fourth grader. How many kilograms of tree species did the two grades collect in total?
四、五年级同学采集树种，五年级采集了19.4kg，比四年级少采4.5kg，两个年级一共采集了多少千克树种？
<gadget id="calculator">19.4 + 4.5 + 19.4</gadget>
<output>43.3</output>

<result>43.3</result>