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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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RS AGGARWAL-RATIO AND PROPORTION-All Questions
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  10. Fourth proportional to(a^2-b^2\ ),\ (a^2-a b),\ (a^3+b^3) is (a-b) ...

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  11. The third proportional to 38 and 15 is (15xx15)/(38) b. (38xx15)/2 ...

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  12. The third proportional to (x^2-y^2)a n d\ (x-y) is (x+y) b. (x-y) c...

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  13. The mean proportional between 234 and 104 is a. 12 ...

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  14. The mean proportional between 0.02 and 0.32 is a. 0.3     b. 0.08 ...

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  15. The mean proportional between (3+sqrt(2))a n d\ (12-sqrt(32)) is sq...

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  16. The ratio between the third proportional of 12 and 30 and mean prop...

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  17. The product of the duplicate ratio of 2a :6b\ a n d\ the recipr...

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  18. Find the two numbers whose mean proportion is 12 and the third prop...

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