6. Ba lớp 7A, 7B, 7C trồng được 180 cây. Tính số cây trồng của mỗi lớp, biết rằng số cây trồng của các lớp đó theo thứ tự tỷ lệ với 3, 4, 5 giải nhanh giúp mình với

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