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In an office, one day, 20% of the staff ...

In an office, one day, 20% of the staff members were on leave in the morning session. On that same day, 10% of the staff, who were on leave, came for the afternoon session. If total strength of the office is 400, then how many were present for the evening session? (The persons who were present in the morning session were also present in the afternoon session)

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