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Daca 3ab+5ab=860 calculati a+b

Răspuns :

300 + a*10 + b + 500 + a*10 + b= 860
a*20 + 2*b = 860 - 800
a*20 + 2*b = 60 | : 2
a*10 + b = 30

a < 10; a≠0 ⇒ a = 3
b < 10 ⇒ b = 0

a + b = 0 + 3 = 3