The sum of the ages of the mother and daughter this year is 70 years old. After 7 years, the age of the mother is twice that of the daughter. What is the age of the mother this year?
母女两人今年的年龄和是70岁，7年后，母亲的年龄是女儿的2倍，母亲今年的年龄是多少岁？
<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">70 + 14</gadget>
<output>84</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">84 / 3</gadget>
<output>28</output>

<gadget id="calculator">28 * 2</gadget>
<output>56</output>

<gadget id="calculator">56 - 7</gadget>
<output>49</output>

<result>49</result>