Xiaohong is 7 years old this year, younger than her father (28/35), how old is Xiaohong's father this year?
小红今年7岁，比爸爸小(28/35)，小红的爸爸今年多少岁．
<gadget id="calculator">28 / 35</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">7 / (1/5)</gadget>
<output>35</output>

<result>35</result>