Question (73/75)

If `1/5 : 1/X = 1/X : 1/1.25`  , then what is value of X ?

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(A)  1.5

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(B)  2

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(C)  2.5

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(D)  3.5

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Question (74/75)

A : B = 2 : 3
B : C = 4 : 5
C : D = 6 : 7
Then, what is A : B : C : D ? 

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(A)  16 : 22 : 30 : 35

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(B)  16 : 24 : 15 : 35

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(C)  16 : 24 : 30 : 35

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(D)  18 : 24 : 30 : 35

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