The weight of a cow is 30 times that of a monkey. The weight of a monkey is 15 kg. The weight of a sheep is 30 kg heavier than that of a monkey. How much heavier is a cow than a sheep?
牛的体重是猴子的30倍，猴子的体重是15千克，羊比猴子重30千克，牛比羊重多少千克？
<gadget id="calculator">15 * 30</gadget>
<output>450</output>

<gadget id="calculator">15 + 30</gadget>
<output>45</output>

<gadget id="calculator">450 - 45</gadget>
<output>405</output>

<result>405</result>