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If a : b=7:9\ a n d\ b : c=15 :7 then...

If `a : b=7:9\ a n d\ b : c=15 :7` then what is `a : c ?` `3:5` b. `5:3` c. `7: 15` d. `7: 21`

A

`5:3`

B

`3:5`

C

`7:21`

D

`7:15`

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The correct Answer is:
A
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