A

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Q. The average age of a group of 10 friends is 15 yr. If one friend leaves the group, the average becomes 16 yr. Find the age of the friend who left the group.

  • (A) 5 yr
  • (B) 4 yr
  • (C) 6 yr
  • (D) None of these
  • Correct Answer - Option(C)
  • Views: 19
  • Filed under category Math
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Explanation by: Admin
Age of friend left = Previous average of the age - Number of persons present x Increase in average age
= 15 - ( 10-1 ) x ( 16-15 )
= 15- 9 x 1
= 15 - 9 = 6yr

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