In a department, of the staff work part-time. The remaining 20 staff work full-time. How many staff are in the department?
Answer and explanation
Correct answer: D. 80
- Step 1: Full-time share .
- Step 2: If of the staff is 20, the total is .
Answer
80.
Why not the others: 60: that is the number of part-time staff. 40: the full-time share is calculated with the wrong fraction.
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