Obviously, I am 10 years old this year, my father's age (2/7), my grandpa's age is my father's age (9/5), how old is my grandpa this year?
明明今年10岁，是爸爸年龄的(2/7)，爷爷年龄是爸爸年龄的(9/5)，爷爷今年多少岁？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">10 / (2/7)</gadget>
<output>35</output>

<gadget id="calculator">9 / 5</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">35 * (9/5)</gadget>
<output>63</output>

<result>63</result>