How many times as large is the approximate radius of mercury atom, 1.5 x 10 meter, as the approximate radius of a hydrogen atom, 2.5 x 10

The correct question is
how many times as large is the approximate radius of a mercury atom, 1.50*10^-11 meter, as the approximate radius of a hydrogen atom, 2.5*10^-11

Since both are conveniently > *10^-11
we can just divide 2.5 by 1.5

2.5/1.5> 1.6666
So a hydrogen atom is 1.67 times larger than a mercury atom

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.