The average age of 8 members of a group is 40 years. The age

The average age of 8 members of a group is 40 years. The age of 1 member is 55 yrs. After his retirement a new member comes in his place, whose age is 39. The average age of group will decrease by? (a) 2 (b) 0 (c) 3 (d) 5 (e) (…)


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