Grandpa is 65 years old this year, and father's age is grandpa's (3/5), how old is father this year?
爷爷今年65岁，爸爸的年龄是爷爷的(3/5)，爸爸今年多少岁？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">65 * (3/5)</gadget>
<output>39</output>

<result>39</result>