let unit digit be x
then tens digit is 9-x
the number is : 10(9-x) + x
= 90 - 9x
the number reversed is 10x + 9-x
= 9x + 9
9x+9 - (90-9x) = 27
18x - 81 = 27
18x = 108
x = 6
unit digit is 6
tens digit is 3
The number is 36
Sum of
the digits of a two-
digit number is 9.
When we
interchange the
digits, it is found
that the resulting
new number is
greater than the
original number by
27. What is the two-
digit number?
2 answers
Dl vv
1 answer