If the first person weighs 120 on Earth and 20 on the moon, then the ratio of weight on moon to weight on Earth would be 20/120 or 1/6. This means that your weight on the moon would be 1/6 of your weight on Earth. In other words, a 93 pound person on earth would weigh 93/6 or 15.5 on the moon. Your answer is 15.5 pounds.