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A two-digit number whose sum of digits is reverses when 63 is added to that number The number is :
1. 18
2. 27
3. 36
4. 45

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Correct Answer - Option 1 : 18

Calculation :

Let the two digit number be 10x + y 

Wen digits reversed, the number will be = 10y + x 

Accordinly,

10x + y + 63 = 10y + x 

⇒ 10x - x + y - 10y = -63

⇒ 9x - 9y = -63 

⇒ x - y = -7

⇒ y - x = 7 

Go through the options there is only one option whose digit difference is 7, which is 18.

∴ The required answer is 18.

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