a+b+c = 486
b:a = 3 r 18
b = 3a+18
c:b = 2 r 12
c = 2b+12
c = 2(3a+18)+12
c = 6a+36+12
c = 6a+48
a+3a+18+6a+48=486
10a = 486-(18+48)
10a = 486-66
10a = 420
a = 420:10
a = 42
b = 3a+18
b = 3*42+18
b = 126+18
b = 144
c = 6a+48
c = 6*42+48
c = 252+48
c = 300
Verificare
42+144+300 = 186+300 = 486