6 years ago, the age of the mother was 5 times that of the daughter; 6 years later, the sum of the ages of the mother and daughter is 78 years old, how old is the mother this year?
6年前，母亲的年龄是女儿的5倍；6年后，母亲和女儿的年龄和是78岁，母亲今年多少岁．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">78 - 12</gadget>
<output>66</output>

<gadget id="calculator">66 - 12</gadget>
<output>54</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">54 / 6</gadget>
<output>9</output>

<gadget id="calculator">9 * 5</gadget>
<output>45</output>

<gadget id="calculator">45 + 6</gadget>
<output>51</output>

<result>51</result>