Question

the sum of a two digit number is 13 the number obtained by interchanging its digit exceeds the given number by 9

Answer 1

Answer:

answer is below

Step-by-step explanation:

Number =y×10+x

x+y=13⇒y=13−x

Interchange digits.

x×10+y= Number +9

x×10+13−x=(13−x)×10+x+9

10x+13−x−130+10x−x−9=0

18x=126

x=7

y=6

Number =60+7=67