How much will he weigh on a different planet

[rcmango]

Homework Statement

A space traveler weighs 500 N on earth. What will the traveler weigh on another planet whose radius is three times that of Earth and whose mass is twice that of earth?

answer in Newtons

Homework Equations

The Attempt at a Solution

i think the formula looks something like this, F = G(m1 * m2) / r^2 but I'm wrong somehow, also there are missing variables. This problem does not look very hard, just need help setting it up.

 

[DaveC426913]

You could do it that way, but you don't actually have to do the numbers.

You are given two factors affecting your weight. What effect does each of them (individually) have generally/algebraically on your weight (as related to Earth=1)?