Problem: a man is 22 years older than his son . in two years , his age will be twice the age of his son . the present age of his son is :
Rationale: "let the son ' s present age be x years . then , man ' s present age = ( x + 24 ) years . ( x + 22 ) + 2 = 2 ( x + 2 ) x + 24 = 2 x + 4 x = 20 . answer : c"
annotated_formula: divide(subtract(22, subtract(multiply(const_2, const_2), const_2)), subtract(const_2, const_1))