The average age of a group of 4 friends is 36 years. The youngest friend among them is 6 years old. What was the average age of the group at the time of the birth of the youngest friend.
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Answer:30
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av.age for 4 friends =36
j,rg dhdthtsd,fh KDHUCKAUSDADHKAHDLADJLAage of 1 friend=36/4=9
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