Răspuns :
m + n = 110
n = m + 30
m + (m + 30 ) = 110⇒ m +m = 110 - 30 ⇒ 2m = 80⇒ m = 40
n = m +30 =40 +30 = 70
deci m = 40 si n = 70
verificare
m + n =110
40 +70 = 110
110 = 110
m+n=110
n=m+30
m+ (m+30)=110
2m+30=110
2m=110-30
2m=80
m=40
n=m+30=40+30=70
n=70