Question

A number consist of two digit whose sum is 9 if 9 is added from the number the digit interchange their places find the number

Answer 1

Answer:

10x + y

x+y=9. (i)

10x + y +9=10y+x

9x-9y=-9

x-y=-I. (2)

2x = 8, x=4.

x + y = 9, put this is eqn (1)

4+y=9

y = 5

Number. is 45

Answer 2

hope this helps you...