Each toy car is 45 yuan, and each toy motorcycle is 84 yuan. How much more expensive is a toy car than a toy motorcycle?
玩具汽车每辆45元，玩具摩托车每2辆84元，玩具汽车比玩具摩托车每辆贵多少元？
<gadget id="calculator">84 / 2</gadget>
<output>42</output>

<gadget id="calculator">45 - 42</gadget>
<output>3</output>

<result>3</result>