Question

the difference between a two digit no and the no obtained on interchanging the digits is 63what is the difference between the digits of the no

Answer 1

Let the tens place digit be a

And Unit place digit be b

According to question,

(10a + b) - (10b + a) = 63

=> 10a + b - 10b - a = 63

=> 9a - 9b = 63

=> a - b = 7

Difference between digits = 7

Answer 2

hye

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let the initial nuber be xy

digit at tens place = 10x

digit at ones place = y

so the number is 10x +y


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now when  it is reversed it becomes

=>10y +x

=>given that The difference between a two digit no and the no obtained on interchanging the digits is 63

=>so let us form an euqtaion

=> 10x +y = 10y +x +63

=>10x +y - 10y  -x =63

=>9x - 9y = 63 

now let us divide 9 in all the cases

=>x - y =7

∴difference between the digits  is 7

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hope it helps u.............