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if (a)/(b)=(c)/(d)=(e)/(f)=(1)/(3), then...

if `(a)/(b)=(c)/(d)=(e)/(f)=(1)/(3)`, then `(5a+3c+7e)/(5b+3d+7f)=`_________

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The correct Answer is:
`1/3`
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PEARSON IIT JEE FOUNDATION-RATIO, PROPORTION AND VARIATION-TEST YOUR CONCEPTS
  1. The mean proportional to 4 and 9 is 6. is it true or false?

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  2. The numbers 3, 6, 8, 12 are in proportion. Is it true r false?

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  3. if (a)/(b)=(c)/(d)=(e)/(f)=(1)/(3), then (5a+3c+7e)/(5b+3d+7f)=

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  4. Find x if 2, 7, 5 (x/2) are in proportion.

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  5. Find the mean proportional of 16 and 4.

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  6. If 7:15=56:x, then what is the value of x?

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  7. Find the fourth proportional to 72, 168, and 150.

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  8. If the cost of 15 books is Rs. 90, then what is the cost of one book?

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  9. When x = 2, 7, 11, …, y = 8, 28, 44, …, then x and y are in .

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  10. When x and y are in indirect proportion and if y doubles, then x becom...

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  11. Eight men can do a certain amount o work in 3 days. Sixteen men can do...

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  12. The ratio obrtained when 9:11 is written with its consequent equal to ...

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  13. A and B share some marbles in the ratio 4 : 5. If B gets 10 marbles mo...

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  14. A and B share some marbles in the ratio 4 : 5. If B gets 10 marbles mo...

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  15. If A : B = 3 : 4 and B : C = 12 : 13, then find A : C.

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  16. If x, 20, 30, and 60 are in proportion, then what is the value of x?

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  17. The sub-duplicate ratio of 64 : 81 is .

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  18. If x : y = 5 : 7, then find (3x+4y):(x+2y).

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  19. If 40 men complete a piece of work in 5 days, then 80 men can complet...

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  20. The area of a circle (A) varies directly as the square of its radius. ...

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