Xiao Ming was 11 years old last year. This year, his mother’s age is 3 times that of Xiao Ming’s. Grandma’s age is 4 years younger than her mother’s. How old is grandma this year?
小明去年11岁，今年妈妈的年龄是小明的3倍，奶奶今年的年龄比妈妈的2倍少4岁，奶奶今年多少岁？
<gadget id="calculator">11 + 1</gadget>
<output>12</output>

<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<gadget id="calculator">72 - 4</gadget>
<output>68</output>

<result>68</result>