Xiaogang is 9 years old this year, and his grandfather is 57 years old this year. How many times was Xiaogang's age last year?
小刚今年9岁，爷爷今年57岁，去年爷爷的岁数是小刚的几倍？
<gadget id="calculator">57 - 1</gadget>
<output>56</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">56 / 8</gadget>
<output>7</output>

<result>7</result>