10. the average age of a family of 5 members is 20 years. If the age of the youngest member be 10 years then what was the average age of the family at the time of the birth of the youngest member?
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Answered by
1
Answer:
10
Step-by-step explanation:
currently the combined age of the family is 20x5=100 10 years ago the combined age of the family would have been 50 because they all age 10 years backwards so 100-10x5=50 since the baby is just being born there is 5 in the family so 50/5=10
Answered by
8
Answer:
The average age of a family of 5 members is 20 years.
Total age will be 20yrs × 5 =100yrs.
If the age of the youngest member be 10yrs, then 10yrs ago, the total age is
100 - (10 × 5) = 50yrs
Also, 10yrs ago, the total member in the family is 4
Therefore, the average age of the family at the time of birth of the youngest member is
50÷4 = 12.5
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