Respuesta :

42:6 = 28/n
42/6 = 28/n
42*n = 6*28 ... cross multiply
42*n = 168
42*n/42 = 168/42
n = 4

Answer is choice A

As a check, we would plug n = 4 back into the original equation

42/6 = 28/n
42/6 = 28/4
7 = 7

Answer is confirmed

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