gravitaional attraction between two objects

1. The problem statement, all variables and given/known data
If the mass of the Earth were twice as big, and the mass of the moon were three times bigger, by what factor would the gravitational attraction between the two be multiplied?

2. Relevant equations

3. The attempt at a solution
Ive used this formula and failed twice to get the correct answer. please help.

http://ift.tt/1kSjUu6

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