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1/2 ingles m.c.m(2,3) = 6
1/3 frances 1/2 = 3/6
resto= 5 1/3 = 2/6
3/6 + 2/6 = 5/6
6/6 - 5/6 = 1/6 = 5 alumnos
5 x 6 = 30 alumnos en clase
3 x 5 = 15 estudian ingles
2 x 5 = 10 estudian frances
los que restan son 45-5:40
1/2 de 40= 20
1/3 de 20= 13