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What x is added to each of 9,15,21 and 3...

What x is added to each of 9,15,21 and 31 the number so obtained are in proportion . What is the mean proportion between the numbers (3x - 2) and (5x + 4) ?
9,15,21 और 31 प्रत्येक में x जोड़ा जाय तो प्राप्त संख्या अनुपात में हैं। संख्या (3x - 2) और (5x + 4) के बीच माध्य अनुपात क्या है?

A

35

B

20

C

30

D

42

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PINNACLE-RATIO & PROPORTION-EXERCISE
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  4. The monthly incomes of A and B are in ratio 3 : 5 and the ratio of the...

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  5. A person divided a certain sum between his three sons in the ratio 3 :...

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  9. A,B and C invested capital in ratio 5 : 7 : 4, the time of their inves...

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  10. If a : b : c =1/4:1/3:1/2, then a/b : b/c: c/a =? यदि a : b : c =1/...

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  11. When x is subtracted from each of 19, 28, 55 and 91, the numbers so ob...

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  12. A and B enter into a partnership with capital in the ratio 5 : 6. Afte...

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  13. The sum of three natural numbers is 280. If the ratio between the firs...

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  14. The ratio of boys and girls in a school is 27: 23. If the difference b...

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  15. The ratio between the present ages of A and B is 3:5. If the ratio of ...

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  16. A, B and C started a business by investing ₹13,750, ₹16,250 and ₹18,75...

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  17. Seven years ago,the ratio of the ages of A and B was 4 : 5. Eight year...

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