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at least how many dogs do i own if more than half dogs are m

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at least how many dogs do i own if more than half dogs are male, and more than 40% are female.
怎么做啊?
Answer:7 dogs.
4 male dogs = 57% ---- satisfies the condition that "more than half dogs are male"
3 female dogs = 43% ---- satisfies the condition that "more than 40% are female"