Mingming is 5 years old this year, 25 years younger than his mother. What fraction of his mother's age is Mingming this year?
明明今年5岁，比妈妈小25岁，明明今年的年龄是妈妈年龄的几分之几？
<gadget id="calculator">5 + 25</gadget>
<output>30</output>

<gadget id="calculator">5 / 30</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>