16=4/9 4/9+5/9=9/9 total
16/4=1/9x 5/9=1/9+1/9+1/9+1/9+1/9
4=1/9x 5/9=4x5
5/9=20
no llevan gafas 20 alumnos. mi gracias
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16=4/9 4/9+5/9=9/9 total
16/4=1/9x 5/9=1/9+1/9+1/9+1/9+1/9
4=1/9x 5/9=4x5
5/9=20
no llevan gafas 20 alumnos. mi gracias