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Pedro: p
Hermana: h
ph= 176 --> p= 176/h
p-h= 5
176/h -h= 5
176-h^2 = 5h
h^2 +5h -176= 0
(h+16 ) (h-11 )=0
h+16= 0
h= -16
h-11= 0
h= 11 --> edad de la hermana.
p-h= 5
p-11= 5
p= 16 --> edad de Pedro.