Question

You weigh 750 N.

What would you weigh if the Earth were
three times as massive as it is and its radius
were four times its present value?
Answer in units of N.

Answer 1

Earth suddenly has 3 times as much mass ... weight is 3 times as much

You're suddenly 4 times as far from the center ... weight = (1/4²) = 1/16

New weight = (original weight) x (3/16)

New weight = (750 N) x (3/16)

New weight = 140.6 N