If a ; b=c : d=e :f=1:2,\ t h e n\ (3...

If `a ; b=c : d=e :f=1:2,\ t h e n\ (3a+5c+7e):(3b=5d+7f)` `1:2` b. `1:4` c. `2:1` d. `8:7`

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