Question

the sum of the digits of a two digit number is 9 and difference is 1.the number is ?​

Answer 1

the number 54...

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Answer 2

sum of digits:9

difference:1

let the unit place number is y and tens place is x .

as a result, number will be (10x+y).

GIVEN THAT , x+y=9_______eq1

according to the question,

10x+y+9=10y+x

9 (x-y)=-9

x-y=-1.......eq2

NOW BY 1 AND 2 , WE GET

x=5 and y=4

so the required number is 54

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