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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avg age decreased by 3 months.
so total age decreased for 20 girl= 20×3= 60month= 5 year
so the age of new girl would be 15-5= 10 years.
so total age decreased for 20 girl= 20×3= 60month= 5 year
so the age of new girl would be 15-5= 10 years.
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