Problem: the average weight of 20 persons sitting in a boat had some value . a new person added to them whose weight was 46 kg only . due to his arrival , the average weight of all the persons decreased by 5 kg . find the average weight of first 20 persons ?
Rationale: "20 x + 46 = 21 ( x – 5 ) x = 59 answer : e"
annotated_formula: subtract(multiply(add(20, const_1), 5), 46)