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J + M = 55 (2)
De (1) despejas J
4J = M +5
J = (M+5)/4 (3)
Reemplazas en (2)
J+M= 55
(M+5)/4 + M = 55
(M+5 +4M)/4 = 55
5M +5 = 4×55
5M = 220 - 5
5M = 215
M = 215/ 5
M = 43 años
Reemplazas M en (3)
J = (M+5)/4
J =( 43 +5) /4
J = 48/4
J = 12 años