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If a : b = 1 1/2 : 2 1/4 and b : c = 2 ...

If `a : b = 1 1/2 : 2 1/4` and `b : c = 2 : 3 1/2` then what is a:b:c equal to ?

A

`12:8: 21`

B

`8:21:12`

C

`8:12:21`

D

`21:8:12`

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