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If 1/a :1/b :1/c=3:4:5, then a : b : c (...

If `1/a :1/b :1/c=3:4:5,` then `a : b : c` (a) `5:4:3` (b) `20 : 15 : 12` (c) `9: 12 : 15` (d) `12 : 15 : 20`

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RD SHARMA-RATIO AND PROPORTION-All Questions
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  2. A ratio equivalent to 2:5 is (a)6: 15 (b) 4:5 (c) 5:2 (d) 5:4

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  4. If 2x=3y\ a n d\ 4y=5z , then x : z= (a) 4:3 (b) 8: 15 (c) 3:4 (d) 1...

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  5. If a/2=b/3=c/4, then a : b : c= (a) 2:3:4 (b) 4:3:2 (c) 3:2:4 (d) No...

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  6. If 1/a :1/b :1/c=3:4:5, then a : b : c (a) 5:4:3 (b) 20 : 15 : 12 (c)...

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  9. If a : b=2:5, then (3a+2b)/(4a+b)= (a) (16)/(13) (b) (13)/(16) (c) (2...

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  12. The mean proportional of 6 and 24 is (a)15                          ...

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  14. If the first three terms of a proportion are 3,5 and 21 respectively...

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  15. What must be added to each term of the ratio 9: 16 to make the ratio...

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  16. What least number is to be subtracted from each term of the ratio 15...

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  20. The third proportional of 3 and 27 is (a) 243 (b) 256 (c) 289 (d) ...

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