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ATQ, we can say that Male Mathematics Teachers = 80 × ¾ = 60 Female Mathematics Teachers = 80 × ¼ = 20 Male English Teachers = 2/3 × 60 = 40 Female English Teachers = 1/3 × 60 = 20 Male Teachers in Physics = 40 + 20 = 60 Female Teachers in Physics = 40 Male Teachers in Chemistry = 40/2 = 20 Female Teachers in Chemistry = 40/2 = 20 Required ratio = (60 + 40 + 60 + 20):(20 + 20 + 40 + 20) = 180:100 = 9:5
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