What must be added to each term of the ratio 2 : 5 so that

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

1. 65
2. 78
3. 13
4. 12

Correct Option: C

Let x be added to each term.
According to the question,

2 + x	=	5
5 + x	=	6

⇒ 12 + 6x = 25 + 5x
⇒ 6x – 5x = 25 – 12
⇒ x = 13