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If a : b=2:3\ a n d\ b : c=4:5,\ t h ...

If `a : b=2:3\ a n d\ b : c=4:5,\ t h e n(a+b):(b+c)` is equal to `6:8` b. `8:6` c. `20 : 27` d. `27 : 20`

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