The fruit shop ordered 30 boxes of apples from Uncle Li, and each box weighed the same. Uncle Li picked 18 boxes of apples in the morning, and he had to pick 180 kilograms in the afternoon to complete the order. How many kilograms do these apples weigh?
水果店向李伯伯订购了30箱苹果，每箱苹果同样重．李伯伯上午摘的苹果正好装满18箱，下午还要摘180千克才能完成订单，这些苹果共重多少千克？
<gadget id="calculator">30 - 18</gadget>
<output>12</output>

<gadget id="calculator">180 / 12</gadget>
<output>15</output>

<gadget id="calculator">15 * 30</gadget>
<output>450</output>

<result>450</result>