What number should be added to or subtracted from each term

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What number should be added to or subtracted from each term of the ratio 17 : 24 so that it becomes equal to 1 : 2 ?

1. 5 is subtracted
2. 10 is added
3. 7 is added
4. 10 is subtracted

Correct Option: D

Let the number x be added.

∴	17 + x	=	1
	24 + x		2

⇒ 34 + 2x = 24 + x
⇒ 2x – x = 24 – 34
⇒ x = –10
Hence, 10 should be subtracted.