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contador 8 1/8
estudiante 12 1/12
juntos x 1/x
PLANTEO DE LA ECUACION
1/8 + 1/12 = 1/x ; multiplicando todo por 24x para eliminar denominadores:
3x + 2x = 24
5x = 24
x = 24/5 h = 4 4/5 h = 4.8 h