Three years ago, the age of the father was four times that of the daughter. The father is 43 years old this year. How old is the daughter this year?
三年前爸爸年龄是女儿的4倍，爸爸今年43岁，女儿今年多少岁．
<gadget id="calculator">43 - 3</gadget>
<output>40</output>

<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">10 + 3</gadget>
<output>13</output>

<result>13</result>