A question that just popped in my head after reading an article:

> 
> If the radius of Planet X is 16% larger than that of Earth, and Planet X has 40% the radius of Planet Y, then what is the radius of Planet Y in terms of Earth radii?
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> 
> 

I'm having trouble trying to figure this one out. How would we solve this one?

I understand we may have to define one variable in terms of another to get the desired result, but again, I seem to be failing miserably at it.