2a=b:2=c:3=d-12=e+569
a+b+c+d=15238
2a=e+569 ⇒e=2a-569
b:2=2a ⇒b=4a
2a=c:3 ⇒c=6a
2a=d-12 ⇒d=2a+12
a+b+c+d=15238
a+4a+6a+2a+12+2a-569=15238
15a = 15238 - 12 + 569
15a = 15795
a = 1053
b=4a=4212
c=6a=6318
d=2a+12=2118
e=2a-569=1537
a = 1053, b = 4212 , c = 6318 , d = 2118 si e = 1537