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Option 3 : Both I & II together are sufficient 

Sum of 8 son and 2 daughter = 15 × 10 = 150

From statement I :

Let daughter’s age is x, x + 6

From statement II :

Sum of 8 son = 12 × 8 = 96

Sum of two daughter = 150 - 96 = 54

From statement I and II:

x + x + 6 = 54

⇒ x = 24 years

So, the age of elder daughter = x + 6 = 24 + 6 = 30 years

∴ Both statement I and II are sufficient.

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