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Kaneki0Ken
i dont really remember how to solve this since i done this some time ago the angles must be the same i would say d since 5 the bigger triangle is five times bigger 

~ hope this helps ~
altavistard
First, y and 40 degrees would have to be the same; thus, y = 40 degrees.

Second, form and solve the ratio (x/25) = (6/30).  30x=25(6)=150.  Thus, x=5.