In a group there are 20 girls, whose average age is decreased by 3 months, when one girl
aged 15 years is replaced by a new girl. What is the age of new girl? /
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20 ×3 =60 /12 =5 year reduce total
so the girl with leave is elder to new girl or
tthe age of new is less than old thats why it reduce
so 15 -5 =10 yrs old new girl
so the girl with leave is elder to new girl or
tthe age of new is less than old thats why it reduce
so 15 -5 =10 yrs old new girl
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