Xiao Ming is 15 years old this year, and his grandfather is 8 years old, four times older than Xiao Ming. How old is grandpa this year?
小明今年15岁，爷爷的年龄比小明的4倍多8岁，爷爷今年多少岁？
<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">60 + 8</gadget>
<output>68</output>

<result>68</result>