Answer:
the radius of planet B is times the radius of planet A
Explanation:
The surface gravity of a planet is given by
where
G is the gravitational constant
M is the mass of the planet
R is the radius of the planet
For the two planets in the problem, we have:
(same gravity)
(planet B has twice the mass of planet A)
So we can write
so, the radius of planet B is times the radius of planet A.