a) 2 : 1
b) 14 : 3
c) 7 : 2
d) 1 : 2
Answer: a
Explanation:
$$\eqalign{
&\,\,\,\, {\text{ }}a{\text{ }}:{\text{ }}b{\text{ }}:{\text{ }}c \cr
&\,\,\,\, {\text{ }}3{\text{ }}:{\text{ }}4{\text{ }}:{\text{ }}7{\text{ }} \cr
& \boxed{\,\,3x:4x:7x\,\,\,\,} \Rightarrow 14x \cr
& a + b + c = 14x \cr
& c = 7x \cr
& \left( {a + b + c} \right):c = 14x:7x \cr
& = 2:1 \cr} $$
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