This year Fangfang's age is her mother's age (1/5), 14 years later Fangfang's age is her mother's age (3/7), how old is Fangfang this year?
今年芳芳的年龄是她妈妈年龄的(1/5)，14年后芳芳的年龄是她妈妈年龄的(3/7)，今年芳芳多少岁．
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">14 * (3/7)</gadget>
<output>6</output>

<gadget id="calculator">14 - 6</gadget>
<output>8</output>

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

<gadget id="calculator">(3/7) - (1/5)</gadget>
<output>8/35 = around 0.228571</output>

<gadget id="calculator">8 / (8/35)</gadget>
<output>35</output>

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

<result>7</result>