Grandpa is 64 years older than Yun Yun, and this year Grandpa is exactly 9 times older than Yun Yun. How old is grandpa? (Solution of column equation)
爷爷比云云大64岁，今年爷爷的年龄恰好是云云的9倍．爷爷今年几岁？(列方程解)
<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">64 / 8</gadget>
<output>8</output>

<gadget id="calculator">8 * 9</gadget>
<output>72</output>

<result>72</result>