А = 0,4В
В = 0,8С => C = B/0.8
A : C = 0.4 B : B/0.8
A : C = 0.4 B * 0.8/B
A : C = 0.32
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Verified answer
А = 0,4В
В = 0,8С => C = B/0.8
A : C = 0.4 B : B/0.8
A : C = 0.4 B * 0.8/B
A : C = 0.32