Seeing double

Five circles, of which the green circles are congruent and so are the blue ones. If rblue : rgreen= 6, what’s rred : rgreen?

Scroll down for a solution to this problem.


Red : green radius is either 2 : 1 or 3 :1.

Solution by Dmitriy Spiridonov.


Seeing double
Yes I see double
Two blue planets
United as in a mirror
A very generous and fertile
Which begets a red planet
A world of hope
Bathed by blue oceans
A core of the earth’s crust
Is ready to burst
A world of serenity


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