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Nieta = t
s + t = 72
s - t = 44
-----------------
2s + 0t = 116
2s = 116
s = 116/2
s = 58
El valor de s lo sustituyo en ecuación 1
s + t = 72
58 + t = 72
t = 72 - 58
t = 14
La nieta tiene 14 años y la abuela 58 años