Question

the sum of the digit of a two digit number is 3 if we subtract 9 from the number the digit are reversed find the original number ​

Answer 1

Step-by-step explanation:

let the number be 10x+y.

given x+y=3.......let this equation be 1

given if 9 is subtracted the digits are reversed.

10x+y-9=10y+x

9x-9y=9

x-y=1 let this equation be 2.

from 1 and 2 equations....

x+y+x-y=4

2x=4

x=2

x+y=3.

y=1.

the number is 21....

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