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The average age of a jury of 5 is 40. If a member aged 35 resigns and a man aged 25 becomes a member, then the average age of the new jury is
- A30
- B38
- C40
- D42
Answer not set
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CCommunity
The average age of a jury of 5 is 40.
∴The total age of the members of the jury is (5 × 40) = 200.
A member aged 35 resigns.
Current total age of the jury of 4:
= 200 – 35
=165
A man aged 25 becomes a member of the jury.
New total age of the jury of 5:
= 165 + 25
= 190
The new average age of the jury of 5 is:
= 190 ÷ 5
= 38
∴The total age of the members of the jury is (5 × 40) = 200.
A member aged 35 resigns.
Current total age of the jury of 4:
= 200 – 35
=165
A man aged 25 becomes a member of the jury.
New total age of the jury of 5:
= 165 + 25
= 190
The new average age of the jury of 5 is:
= 190 ÷ 5
= 38