The fruit shop ships 15 boxes of apples and 12 boxes of pears, each box of apples weighs 15 kilograms, and each box of pears weighs 18 kilograms. How many kilograms are there in total?
水果店运来15箱苹果和12箱梨，每箱苹果15千克，每箱梨18千克，运来的苹果和梨一共有多少千克？
<gadget id="calculator">15 * 15</gadget>
<output>225</output>

<gadget id="calculator">12 * 18</gadget>
<output>216</output>

<gadget id="calculator">225 + 216</gadget>
<output>441</output>

<result>441</result>