I had to stare at this puzzle a good long time before I got it:
I had a very hard time figuring out where to start. What finally broke it for me was getting rid of unnecessary complications. For instance, in both the white and the yellow hexagons, three of the vertices don’t enter into the problem. You can replace those hexagons with triangles.
Likewise only two vertices of each of the other two hexagons are important; you can replace them with line segments.
Once you’ve done that the solution becomes obvious, in the sense of “I only had to stare at it another five minutes before saying ‘oh duhh'”. These two line segments are congruent.
As are these two.
These two angles are congruent, since both differ from 60° by the same amount.
So these triangles are congruent.
Now put back the original hexagons.
A side of one hexagon is congruent to a diameter of the other, so it’s twice a side of the other, so the areas of the two hexagons are in a 4:1 ratio. The “pink” (or I’d call it magenta) hexagon’s area is 48.