Problem: chris age after 13 years will be 5 times his age 5 years back . what is the present age of chris ?
Rationale: "chris present age = x after 13 years = x + 13 5 years back = x - 5 x + 13 = 5 ( x - 5 ) x = 12 answer is e"
annotated_formula: subtract(divide(add(multiply(5, 5), 13), subtract(5, const_1)), subtract(divide(add(multiply(5, 5), 13), subtract(5, const_1)), 5))