Question

if the sum of the digit of a two digit number is 9 and the difference between the number and that formed by receiving the digits is 45 then the number is​

Answer 1

Answer:

x+y=9 (i)

(10x+y)−(10y+x)=45

⇒9x−9y=45

⇒x−y=5

⇒x=y+5 (ii)