If 6a - 7b : 5a - 8b = 5 : 6, then a : b is equal to

2025

If 6a - 7b : 5a - 8b = 5 : 6, then a : b is equal to

  1. A.

    1 : 8

  2. B.

    2 : 11

  3. C.

    3 : 19

  4. D.

    7 : 5

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Correct answer: B

6a - 7b : 5a - 8b = 5 : 6

⇒ (6a - 7b)/(5a - 8b) = 5/6

⇒ 6 × (6a – 7b) = 5 × (5a – 8b)

⇒ 36a – 42b = 25a – 40b

⇒ 36a – 25a = 42b – 40b

⇒ 11a = 2b

⇒ a/b = 2/11

∴ a : b = 2 : 11

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