Respuesta :

Answer:

Step-by-step explanation:

let 4 no:s be x, 3x, 5x, 7x

given, x+3x+5x+7x=80

        16x = 80

        x = 80/16

    therefore, x=5

so,   x=5  

    3x=15

    5x= 25

    7x= 35

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