The fourth and fifth grade students went to pick strawberries. The fourth grade picked 18.3 kilograms, and the fourth grade picked 2.85 kilograms more than the fifth grade. How many kilograms of strawberries did the two grades pick in total?
四、五年级学生去采草莓，四年级采了18.3千克，四年级比五年级多采了2.85千克，两个年级一共采了多少千克草莓？
<gadget id="calculator">18.3 - 2.85</gadget>
<output>15.45</output>

<gadget id="calculator">15.45 + 18.3</gadget>
<output>33.75</output>

<result>33.75</result>