A) 8 : 7
B) 2 : 1
C) 1 : 4
D) 1 : 2
Correct Answer: D
Solution :
\[\frac{a}{b}=\frac{c}{d}=\frac{e}{f}=\frac{1}{2}\] \[\therefore \] \[\frac{3a}{3b}=\frac{5c}{5d}=\frac{7e}{7f}=\frac{1}{2}\] \[\therefore \] \[\frac{3a+5c+7e}{3b+5d+7f}=\frac{1}{2}\]You need to login to perform this action.
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