Question

Afla a , b si c daca :

a+b+c=905 , b:a=3 rest3 ,c:b=20 rest 10

Answer 1

a+b+c=905
b:a=3 rest 3 ⇒ b=3a+3
c:b=20 rest 10 ⇒ c=20b+10⇒ c=20(3a+3)+10⇒ c=60a+60+10⇒ c=60a+70
a+3a+3+60a+70=905
64a=905-70-3
64a=832
a=832:64
a=13
b=3x13+3
b=42
c=20x42+10
c=850
V: 13+42+850=905