Known: A+10= B -20=2 C = D /2.

So: b = a+30 c = (a+10)/2d = 2 (a+10).

Because: A+B+C+D =370.

So: a+a+30+(a+10)/2+2 (a+10) = 370.

D: A =70。

D: B = 100 C =40 D = 160。