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If a ,\ b ,\ c are in proportion, then (...

If `a ,\ b ,\ c` are in proportion, then (a) `a^2=b c` (b) `b^2=a c` (c) `c^2=a b` (d) None of these

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RD SHARMA-RATIO, PROPORTION AND UNITARY METHOD-All Questions
  1. If 5:4 30 : x , then the value of x is 24 (b) 12 (c) 3/2 (d)...

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  2. If a ,\ b ,\ c ,\ d are in proportion, then (a)a b=c d (b) a c=b d a...

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  3. If a ,\ b ,\ c are in proportion, then (a) a^2=b c (b) b^2=a c (...

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  4. If the cost of 5 bars of a soap is Rs. 30, then the cost of one doze...

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  5. 12 men can finish a piece of work in 25 days. The number of days in ...

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  6. If the cost of 25 packets of 12 pencils each is RS. 750, then the co...

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  7. If a ,\ b ,\ c are in proportion, then (a) a : b :: b : c (b) a :...

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  8. If a=2b ,\ then a : b= 2:1 (b) 1:2 (c) 3:4 (d) 4:3

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  9. If 4:3=x^2: 12 , then the value of x\ (x >0)dot 16 (b) 4 (c) 9 ...

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  10. If x : y=2:3\ a n dy : z=2:3,\ then x : z= 2:3 (b) 3:4 (c) 5:7...

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  11. If 80 : 60=x : 12 , then x= 16 (b) 7 (c) 24 (d) 50

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  12. Two numbers are in the ratio 3:5 and their sum is 96. The larger nu...

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  13. If x : y=1:1,\ t h e n\ (3x+4y)/(5x+6y)= (a) 7/(11) (b) (17)/(11) (c)...

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  14. If six men can do a piece of work in 6 days, then 3 men can do same...

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  15. If 4:5 x : 45 ,\ then x= 54 (b) 60 (c) 36 (d) 30

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  16. If 343 is the third proportional of \ a\ a n d\ b , where a : b=1:7, t...

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  17. The first three terms of a proportion are 12, 21 and 8 respectively...

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  18. If a : b=2:5, . fid the value of (3a+2b)/(4a+b)

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  19. The mean proportional of a\ a n d\ b is 10 and the value of a is four ...

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  20. A given quantity of rice is sufficient for 60 persons for 3 days. H...

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