kettle costs 45 yuan, which is 16 yuan more expensive than a teacup. How much is the price of this teacup?
一把水壶售价45元，比一个茶杯的售价贵16元．这个茶杯的售价多少元？
<gadget id="calculator">45 - 16</gadget>
<output>29</output>

<result>29</result>