Problem: a fruit seller had some oranges . he sells 40 % oranges and still has 600 oranges . how many oranges he had originally ?
Rationale: "60 % of oranges = 600 100 % of oranges = ( 600 × 100 ) / 6 = 1000 total oranges = 1000 answer : c"
annotated_formula: add(600, multiply(600, divide(40, const_100)))