I suck at math but what's greater 0.67 or 0.6

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.

3x = 729 solve for x plz . it's urgent. will mark

How many 3/8s are in 6 plz someone tell me now