The store shipped 12 boxes of apples and 15 boxes of oranges. Each box weighs 15 kilograms. How many kilograms do these fruits weigh in total?
商店运来12箱苹果，15箱桔子，每箱水果重15千克，这些水果一共重多少千克？
<gadget id="calculator">12 + 15</gadget>
<output>27</output>

<gadget id="calculator">15 * 27</gadget>
<output>405</output>

<result>405</result>