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Veamos: Digamos que el espacio es ocupado por el numero "x",ahora:
4/7 de x = 80
4(x)/7 = 80
4x = 80(7)
4x=560
x= 560/4
x=140
Asi que el numero que falta (x) es 140
Buen dia!
4/7 (x) = 80
4x/7 = 80
4x = 80 (7)
4x = 560
x = 560/4
x = 140
4/7 de 140 = 80