What number must be added to numerator and denominator of

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What number must be added to numerator and denominator of 3/4 to give 11/12 ?

1. 5
2. 6
3. 7
4. 8

Correct Option: D

Let (3 + x)/ (4 + x) = 11/12.
Then, 12(13 + x) = 11 (4 + x)
⇒ x = 44 - 36 = 8