The sum of mother and daughter's age is 64 years old, the daughter's age is three times older than the mother's by 8 years, what is the mother's age?
母女的年龄和是64岁，女儿年龄的3倍比母亲大8岁，母亲的年龄是多少岁．
<gadget id="calculator">8 + 64</gadget>
<output>72</output>

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

<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<gadget id="calculator">64 - 18</gadget>
<output>46</output>

<result>46</result>