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3k + 2k = 400
k = 80
3k = 3(80) = 240
por cada dos 2 hombres hay una mujer, 2k + k = 240
Total - 2k+k = 400 - 240 = 160 personas
160/2 = 80
#se retiraron 80 parejas.
*(2 personas----> una pareja)