Dad's age is three times that of Xiaojun's, and (3/5) his grandfather's age. Xiaojun is 12 years old, how old is his grandfather?
爸爸的年龄是小军年龄的3倍，又是爷爷年龄的(3/5)，小军12岁，爷爷有多少岁？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<result>60</result>