Toán thực tế (027)

Trong tất cả các học sinh khối 6 của một trường,
có 37 học sinh tham gia cuộc thi Toán, 49 học sinh tham gia cuộc thi Khoa học,
18 học sinh tham gia cả hai cuộc thi và 83 học sinh không tham gia cuộc thi nào.
Hỏi khối lớp 6 của trường đó có bao nhiêu học sinh?

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