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Option 5 : Neither statement I nor statement II is sufficient to answer the question
From statement I
Geometric mean of two units x and y = √xy
⇒ √xy = 8
⇒ xy = 64
⇒ x = 64/y
From statement II
Arithmetic mean of two units x and y = (x + y) / 2
⇒ x + y = 20
Using both the statements
⇒ 64/y + y = 20
⇒ 64 + y2 = 20y
⇒ 64 + y2 – 20y = 0
Y could be 16 or 4 if y is 16 x must be 4 and if y is 4 then x must be 16 so we cannot answer the question and we need more data to answer the question.
Since We cannot get the answer from the statements I and II together,
∴ Neither statement I nor statement II is sufficient to answer the question
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