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Sean los niños 1-A 2-B 3-C
A + B = 7 A = 7 - B
C + B = 6 C = 6 - B Sustituimos los valores de A y C en
A + B + C = 11 7 - B + B + 6 - B = 11
-B + 13 = 11 -B = 11 - 13 -B = -2 B = 2
Sustituimos en A + B = 7 A + 2 = 7 A = 5
C + B = 6 C + 2 = 6 C = 4
R/ En su orden pescaron 5, 2 y 4.