Nếu Một người đàn ông trồng tất cả 12 cái cây trong vườn . khi trồng xong , ông ta phát hiện rằng , ông ta vẫn còn thừa vườn 

Ông ta định trồng thêm 12 cái cây nữa nhưng không đủ để trồng thêm . Vậy ông ta chỉ trồng một số cây nữa 

Hỏi , ông ta đã trồng tất cả bao nhiêu cây ? ( biết ông ta đã trồng thêm một số cây đã dự đoán )

đâu là chữ w:

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