Problem: the sum of the ages of 5 children born at the intervals of 3 years each is 50 years . what is the age of the youngest child ?
Rationale: "let the ages of the children be x , ( x + 3 ) , ( x + 6 ) , ( x + 9 ) and ( x + 12 ) years . then , x + ( x + 3 ) + ( x + 6 ) + ( x + 9 ) + ( x + 12 ) = 50 5 x = 20 = > x = 4 . age of youngest child = x = 4 years . answer : a"
annotated_formula: divide(subtract(divide(50, divide(5, 3)), multiply(subtract(5, const_1), 3)), 3)