Răspuns:
(5/6)×a + (1/3)×a = 42
Aducem la acelasi numitor (adica 6) si obtinem:
5a + 2a = 252
7a=252
a = 252 / 7
a = 36
5/6·a+1/3·a=42
5A+2A=252
7A=252
A=252:7
A=36
