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The sum of the digit of a 2- digit no. is 9. If the digit of the no. are reversed, the new no. is decreased by 9. Find the number. (ANS=54)
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let the digits to be X,Y
sum of their digits =9
=)X+Y=9
whole number = 10X+Y
after interchanging =10Y+X is whole number
u can find continuation in photo
sum of their digits =9
=)X+Y=9
whole number = 10X+Y
after interchanging =10Y+X is whole number
u can find continuation in photo
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