Răspuns
Explicație pas cu pas:
a : ( b : 3 ) = 5 rest 7
a = 5 × ( b / 3 ) + 7
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2 a + b = 170
2 × ( 5 b / 3 + 7 ) + b = 170
10 b / 3 + 14 + b = 170
10 b / 3 + b = 170 - 14
10 b + 3 b = 3 × 156
13 b = 468 ⇒ b = 468 : 13 ⇒ b = 36
2 × a + 36 = 170
2 × a = 170 - 36
2 × a = 134 ⇒ a = 134 : 2 ⇒ a = 67
Verific: 67 : ( 36 : 3 ) = 67 : 12 = 5 rest 7
