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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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