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Numero menor= B
A-B = 12
1/2A = 20
A= 12 + B
1/2A=20
1/2 (12+B) = 20
6+ 1/2B = 20 (%2)
12 + B = 40
B = 40 - 12
B = 28
A = 12 + B
A = 12 + 28
A = 40