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Step-by-step explanation:
mean age of 25 members =38
total age of 25 members =38x25
=950
if 5 members left ,
mean age of 5 members =42
total age of 5 members =42x5
=210
therefore , present mean age
no of members = 25-5 = 20
total age of 20 members =950-210
=740
therefore, mean =740/20
=37
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