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The ratio of grade A officers and grade B officers is 3:7, and that of grade B and grade C officers is 2:5. If

The ratio of grade A officers and grade B officers is 3:7, and that of grade B and grade C officers is 2:5. If the total number of officers is 1375, then find the number of grade A officers? 1. 100 2. 120 150 4. 180 200 3. 5.

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