The average age of the family of five members is 24. If the present age of the youngest member is 8 yr, then what was the average age of the family at the time of the birth of the youngest member?

20 yr

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16 yr

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12 yr

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18 yr

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21 yr

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Solution

The correct option is A 20 yr
Here, total age of five members
= 5 $\times$ 24
= 120 yr
8 yr ago, total age of the family
= 120 - 40
= 80 yr
$∴$ Average $= \frac{80}{4} = 20 y r$

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The average age of the family of five members is 24. If the present age of the youngest member is 8 yr, then what was the average age of the family at the time of the birth of the youngest member?

The correct option is A 20 yrHere, total age of five members = 5 × 24 = 120 yr 8 yr ago, total age of the family = 120 - 40 = 80 yr ∴ Average =804=20 yr

The correct option is A 20 yr
Here, total age of five members
= 5 $\times$ 24
= 120 yr
8 yr ago, total age of the family
= 120 - 40
= 80 yr
$∴$ Average $= \frac{80}{4} = 20 y r$