A swim team at Bedok Swimming Complex has 8 members. Their average training session lasts 42 minutes. When Priya joins the team, the new average drops to 41 minutes. Later, 3 members who each train for exactly 45 minutes per session leave the team. What is the new average training time per session for the remaining members?
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Worked Solution
Step 1: Find the total training time for the original 8 members.
8 × 42 = 336 minutes
Step 2: Find the total training time after Priya joins (9 members, average = 41 min).
9 × 41 = 369 minutes
Step 3: Find Priya's training time per session.
369 − 336 = 33 minutes
Step 4: Find the total training time removed when the 3 members leave.
3 × 45 = 135 minutes
Step 5: Find the new total training time after they leave.
369 − 135 = 234 minutes
Step 6: Find the number of remaining members.
9 − 3 = 6 members
Step 7: Compute the new average.
234 ÷ 6 = 39 minutes
The new average training time is 39 minutes per session.
Correct answer: 39 min
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