A) 25
B) 10
C) 4
D) 100
Correct Answer: B
Solution :
\[{{a}_{1}}:{{a}_{2}}::{{b}_{1}}:{{b}_{2}}\] \[{{a}_{1}}:{{a}_{2}}={{b}_{1}}:{{b}_{2}}\] \[\frac{4}{12}=\frac{7}{21}=\frac{21}{63}=\frac{28}{84}=\frac{1}{3}.\] 10 is the mean proportion.
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