Question

the difference between a two digits number and the number obtained by interchanging the position of its digit is 45.what is the difference the two digits of that number
a)5
b)6
c)7
d)0​

Answer 1

Correct option is

B

5

Let the two digit number be 10x+y and its reverse be 10y+x.

According to the question, 10x+y−(10y+x)=45

10x+y−10y−x=45⇒9(x−y)=45⇒x−y=5

Hence, the difference between the digits is 5.

Answer 2

Answer:

Let the two digit number be 10x+y and its reverse be 10y+x.

According to the question, 10x+y−(10y+x)=45

10x+y−10y−x=45⇒9(x−y)=45⇒x−y=5

Hence, the difference between the digits is 5.

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