Răspuns :
a + b = 494
a : 2b = 3 rest 4
a = 6b + 4
6b + 4 + b = 494
7b + 4 = 494
7b = 494 - 4
7b = 490
b = 490 : 7
b = 70
a = 6b + 4
a = 6×70 + 4
a = 420 + 4
a = 424
verificare:
424 + 70 = 494
a : 2b = 3 rest 4
a = 6b + 4
6b + 4 + b = 494
7b + 4 = 494
7b = 494 - 4
7b = 490
b = 490 : 7
b = 70
a = 6b + 4
a = 6×70 + 4
a = 420 + 4
a = 424
verificare:
424 + 70 = 494