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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`

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RS AGGARWAL-RATIO AND PROPORTION-All Questions
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  11. If A : B=1/2:1/3n a\ d B : C=1/2:1/3,\ t h e n\ A : B : C is equ...

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