Question

a number consists of two digits whose sum is 8 if 18 is added to the number its digits get reversed find the number

Answer 1

Heyy.. It's and is so long.. I think example is surely given at your book
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Answer 2

Let the digits be x and y.
No. will be 10x+y.
Now, As per the question,
10x+y +18 = 10y +x
9x-9y = -18
x-y = -2.
And x+ y = 8 which is given
you will get ,
x= 3 ,y = 5.
No. will be 35.