There are two classes in the fifth grade recycling waste. Class 1 recycles 19.15 kilograms, and class 2 recycles 1.87 kg less than class 1. How many kilograms did the two classes recycle in total?
五年级两个班回收废品，一班回收了19.15千克，二班比一班少回收1.87千克，两个班一共回收了多少千克？
<gadget id="calculator">19.15 - 1.87</gadget>
<output>17.28</output>

<gadget id="calculator">17.28 + 19.15</gadget>
<output>36.43</output>

<result>36.43</result>