When would be only four different equations for a set of math mountain numbers

Weight is dependent on the gravitational force exerted on an object. in other word, in space, you would weigh nothing because there is no gravity. likewise, because the moon's gravitational pull is less than earth's object weigh less on the moon. in general, 1 pound on earth is equal to approximately 0.166 pounds on the moon, about how much, in pounds does he weight on earth? a) 21 b) 48 c) 175 d) 196