Question 13

The difference between a two-digit number and the number obtained by interchanging the digits is 27. What is the differences between the digits of the number ?


Let the unit's digit of the number be $$y$$ and ten's digit = $$x$$

=> Number = $$10x+y$$

After interchanging the digits, new number = $$10y+x$$

According to ques,

=> $$(10x+y)-(10y+x)=27$$

=> $$9x-9y=27$$

=> $$9(x-y)=27$$

=> $$(x-y)=\frac{27}{9}=3$$

$$\therefore$$ Differences between the digits of the number = 3

=> Ans - (A)

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