Question

the average age of 5 members of a family is 21 yrs . if the age of the youngest child is 5 yrs find the average age of the family at the time of his birth​

Answer 1

apurva ..thamb bai ..thoda

explenation..At present the total age of the family = 5 * 21 = 105

The age of the youngest member be 5 years

The total age of the remaing family member during 5 year 4*5=20 after birth of youngest member

The total age of the family at the time of the birth of the youngest member that is 5 year ago => present the total age of the family -age of the youngest member- change in total age of the remaing family member during 5 year

=> 105-5-20 = 80

Therefore, average age of the family at the time of birth of the youngest member =>total age of the family at the time of the birth of the youngest member / number of member in family at the time of birth of the youngest member

=>80/4 = 20

Answer 2

Answer:

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