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The ratio of managers to management trainees is 3:5. When 21 new management trainees are recruited the ratio will become 3:8 How many managers will there be in the group ?
(a) 27 (b) 24 (c) 21 (d) Cannot be determined (e) None of these

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(c) Let the number of manager and management trainees be 3x and 5x respectively.
According to the question,

Number of managers = 3x = 3 × 7 = 21

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