child between the ages of 13 and 19 writes his own age after his father's age to form a four-digit number, and subtracts the age difference between father and son from this four-digit number to get 4289, the age difference between the child and his father. And equal to how much.
一个年龄在13到19岁之间的孩子把自已的年龄写在他父亲年龄的后面成为一个四位数，从这个四位数中减去父子的年龄之差得到4289，孩子与父亲的年龄之和等于多少．
<gadget id="calculator">43 + 16</gadget>
<output>59</output>

<result>59</result>