He hasn't. The mass is the same, but the graviational pull from the Earth is stronger than that from the moon.
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20 kg
Because mass is not the same as weight. Weight is mass times gravity so your weight will change if you are on the earth or moon but your mass will stay the same.
On Earth, the person weighs 165.3 pounds. On the Moon, he would weigh 27.3 pounds.
A person with a mass of 80 kg weighs 176.4 pounds on earth, 28.8 pounds on the moon, and 66.9 pounds on Mars. (all rounded)
If a person's mass is 94 kg, then the person weighs 207.2 pounds on earth, 33.8 pounds on the moon, and 78.7 pounds on Mars. The 94 kg of mass doesn't change, no matter where he is.