Question

a number consists of two digits whose sum is 9.if 9 is subtract from the number the digits intercharge their places .find the number​

Answer 1

Answer:

Let the number be 10x+y

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

10x+y-9=10y+x

9x-9y=9

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

equation. (1) + equation (2)

x+y+x-y = 9+1

2x=10

x=5

y=9-x

=9-5

y=4

Answer 2

Answer:

2x -9 = x+27

2x -x = 27 + 9

x = 36

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