Question

In calculating the force of gravity between two objects, if the mass of one object increased by 4 and the other by 2, how many times would the force of gravity increase?

I still don't understand but drwl's said that its proportional to the product not the sum and my original answer was 6 but I changed it to 8. All I did was multiply 4 and 2 instead of add them so my answer is 8
F1 = GMm/r^2

F2 = G(4M)2m/r^2

F2 = 8GMm/r^2
I got nothing can you put a few words with that please?

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