Problem: the average weight of 10 men is increased by 1 ½ kg when one of the men who weighs 60 kg is replaced by a new man . what is the weight of the new man ?
Rationale: "since the average has increased by 1.5 kg , the weight of the man who stepped in must be equal to 60 + 10 x 1.5 60 + 15 = 75 kg ans : ' d '"
annotated_formula: add(60, multiply(10, add(1, divide(const_1, 1))))