If 2 : 7 ::? : 49 is

(A) 9
(B) 14
(C) 52
(D) 28

Solution:
2 : 7: : ?: 49
2 : 7 = X: 49
2/7=x/49
2 X 49= 7x
2 X 49/7=x
x=14

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