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NIÑAS(N) = 35%*T
NIÑOS = 750
TOTAL = (35*T) + 750
REPRESENTA:
(35*T)/100=N
(35*(N+750))/100 = N
7N + 5250 = 20N
5250 = 13N
N= 404 niñas (redondeando)
Lo resolveria de esta forma