Question

the sum of the digits of a two-digit numbers is 9 if 9 is added to the number the digits are reversed find the number​

Answer 1

Answer:

Let the tens digit be _x

And., One's digit be _y

Given, x+y=9.........(1)

Also,

Acc.to ques.,

10x+y+9 = 10y+x

10x+y-10y-x=-9

9x-9y=-9

x-y=-1.............(2)

Solving 1st and 2nd

We get;

x=4 and y=5

So., the no is

45...ANS.