Which number must be added to each term of the ratio 2 : 5, so that it may equal to 5 : 6 ?

2 : 5 अनुपात वाली प्रत्येक संख्या में कौन - सी संख्या जोड़ी जाए कि प्राप्त संख्याओं का अनुपात 5 : 6 हो जाए ?

1. A12
2. B11
3. C13
4. D14

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Correct answer: C. 13

Explanation

(2 + x)/(5 + x) = 5/6 → 12 + 6x = 25 + 5x → x = 13.

(2 + x)/(5 + x) = 5/6 → x = 13।