Question

a number consists of two digits whose sum is 5.if 9 is subtracted from the number the digits are reversed.find the number.

Answer 1

so ur answer is 10x+y=30+2=32.
Hope the answer is right.

Answer 2

Hey

Here is your answer,

Let the number be 10x +y  ,
    x = ten's place  , y = one's place
x + y = 5          ---> [1]
reversed no: ,
10y + x

10x+ y + 9 = 10y+x
9x - 9y = -9
x - y = -1            ---> [2]

Adding equations 1 and 2

x + y = 5
x - y = -1
_______
2x = 4
x = 2
x -y = -1
2 - y = -1
2 + 1 = y
3 = y

the number is :-
10x + y 
10 x 2 + 3  = 23

The no: is 23

Hope it helps you!