Xiaohua is 10 years old this year, she is 28 years younger than her father, how old was she younger than her father last year?
小花今年10岁，她比爸爸小28岁，去年，她比爸爸小多少岁？
<gadget id="calculator">28 - 1</gadget>
<output>27</output>

<gadget id="calculator">10 + 27</gadget>
<output>37</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">37 - 9</gadget>
<output>28</output>

<result>28</result>