The fruit shop shipped 450 boxes of apples, each weighing 15 kilograms, and sold 225 boxes. How many kilograms of apples are left?
水果店运来450箱苹果，每箱15千克，卖出225箱，还剩多少千克苹果？
<gadget id="calculator">450 - 225</gadget>
<output>225</output>

<gadget id="calculator">225 * 15</gadget>
<output>3_375</output>

<result>3_375</result>