The father is 43 years old this year, and the daughter is 11 years old this year. How many years ago, the daughter's age was that of the father's (1/5).
爸爸今年43岁，女儿今年11岁，多少年前女儿年龄是爸爸的(1/5)．
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">43 * (1/5)</gadget>
<output>43/5 = around 8.6</output>

<gadget id="calculator">11 - (43/5)</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(12/5) / (4/5)</gadget>
<output>3</output>

<result>3</result>