Teacher Zhang said to Qisi: "When I was your age, you were only 3 years old. When you were my age, I was 39 years old. How old is Teacher Zhang?
张老师对奇思说："当我像你这么大的时候，你才3岁，当你像我这么大的时候，我是39岁，张老师的年龄是多少岁？
<gadget id="calculator">39 + 3 + 39</gadget>
<output>81</output>

<gadget id="calculator">1 + 1 + 1</gadget>
<output>3</output>

<gadget id="calculator">81 / 3</gadget>
<output>27</output>

<result>27</result>