When Yixiu was 9 years old, his grandfather was 60 years old. This year Yixiu was admitted to university. The age of his grandfather was exactly 4 times that of Yixiu. How old is he this year?
一休9岁时，他爷爷60岁，今年一休考上大学，爷爷的年龄恰好是一休的4倍，爷爷今年多少岁？
<gadget id="calculator">60 - 9</gadget>
<output>51</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">51 / 3</gadget>
<output>17</output>

<gadget id="calculator">17 * 4</gadget>
<output>68</output>

<result>68</result>