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NIÑOS: N
N+A=280, entonces A=280 - N
Además:
50A + 20N=8000
5A + 2N = 800 ........pero A=280-N
5(280-N)+2N=800
1400 - 5N +2N=800
1400-800=3N
600=3N
N=600/3
N=200
Asistieron 200 niños