Manipulating Mass and Distance to Quadruple Gravitational Force

[rrosa522]

Homework Statement

Two bags, each containing ten oranges of
equal mass, are hung 4.0 m apart. Describe
two situations, one involving mass and the
other involving separation distance, that
would quadruple the gravitational force
exerted by one bag on the other. Explain
your answer

Homework Equations

The Attempt at a Solution

Move the bags closer together or increase the mass... just a guess

 

[haruspex]

Move the bags closer together or increase the mass..

Sure, but it asks specifically for a quadrupling of the force, so you need state how much to increase mass (one, both?) and how much to change distance by.