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If 12.5% of a number is added with itself then the result becomes 720. Find the original number.


1. 630
2. 770
3. 640
4. 670

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Correct Answer - Option 3 : 640

12.5 % = (25/2) × 1/100 = 1/8

Here, Let original number = 8x, number added = 1x

That is, if 100% = 8x then its 12.5% = 1x

⇒ Number after addition = 8x + 1x = 9x = 720

⇒ x = 80

⇒ Original number = 8x = 8 × 80 = 640

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