Question

two digit number is such that the sum of its digit is 4 if 18 is added to the number its digits are reversed find the number

Answer 1

THE ANSWER IS

2+2=4
4+18=22
REVERSED NUMBER

Answer 2

let x and y be the digit.
x+y=4......(1)
Then number=10x+y  (considering x as tens digit and y as once digit)
When 18 is added,
                 New number=10x+y+18
                 It is said that the new number is the reverse of the old one.
                    ⇒ 10x+y+18=10y+x
                   ⇒ 9x-9y+18=0
                    ⇒x-y+2=0
                    ⇒x=y-2
                   put this in the eq(1) and you will get the digits
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