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If Pat weighs 750N on Earth, what would Pat weigh on another planet with twice Earth's mass and one quarter the Earth's radius?

We are not given the exact radius or mass of the Earth and I am having a hard time figuring it out.

I know I have to used the formula Fg =G(m1)(m2)/r squared

I considered also trying to find some kind of ratio (like 2/(.25)squared) but I don't understand how that will help me and what I have to do from there

My test is tomorrow, please help!

Thanks,

Susan