The average age of 5 sisters is 20 , text{yea | vedclass

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(D) The total age of $5$ sisters is $5 	imes 20 = 100 \, 	ext{years}$.At the time of the birth of the youngest sister ($4 \, 	ext{years}$ ago),each

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$20$

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(D) The total age of $5$ sisters is $5 	imes 20 = 100 \, 	ext{years}$.At the time of the birth of the youngest sister ($4 \, 	ext{years}$ ago),each of the $5$ sisters was $4 \, 	ext{years}$ younger.Therefore,the total age of the group at that time was $100 - (5 	imes 4) = 100 - 20 = 80 \, 	ext{years}$.At the time of the youngest sister's birth,there were only $4$ sisters (excluding the youngest one who was $0 \, 	ext{years}$ old).Thus,the average age of the $4$ sisters was $\frac{80}{4} = 20 \, 	ext{years}$.

The average age of $5$ sisters is $20 \, \text{years}$. If the age of the youngest sister is $4 \, \text{years}$,what was the average age of the group of sisters at the time of the birth of the youngest sister?

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