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A-16 = 1/3 A ec. 2
de la ec. 2:
A-16 = 1/3 A
-16 = 1/3 A -A
-16 = -2/3 A
-16/(-2/3) = A
(-16/1)/(-2/3) = A
-48/-2 = A
A = 24
De la ec. 1:
A+B = 36
24+B = 36
B = 36-24
B = 12
Veamos si cumple las condicionantes:
A+B =36
24+12 = 36 ok
si se resta 16 a A sería la tercera parte de lo que era:
24-16 = 8
24/3 = 8 ok
Saludos....