Xiao Gang bought a toy car for 50 yuan, and bought 3 Transformers for 81 yuan. How much is a toy car more expensive than a Transformer?
小刚买一辆玩具汽车花了50元，买3个变形金刚花了81元，一辆玩具汽车比一个变形金刚贵多少钱？
<gadget id="calculator">81 / 3</gadget>
<output>27</output>

<gadget id="calculator">50 - 27</gadget>
<output>23</output>

<result>23</result>