Finding equivalent resistance between terminals ab

[qwerty321]

Hey everyone..I am new to this forum(2nd time I post a thread)

I have this exercice,which I am unable to solve..it has been 1 hour

Determine Req between terminals ab in the figure above



The figure is in the attachement..

In the solution ,they say that Req =30 ohms..but i am not getting this answer..

This is how i am reasoning:

24 and 12 are in parallel

then (24 and 12) with 22 are in series..
but then what next?

thank you

 

[qwerty321]

ok i found it.finally..