Question

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Answer 1

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Answer 2

Step-by-step explanation:

let X and y be digits of no.

X+y=7

the difference between the no. and reversed no. is 9

original no= 10x+y

reversed no=10y+X

(10x+y)-(10y+x)=9

9x-9y=9

X=9+9y

9

put X in X+y=7

9+9y + y =7

9

9+18y=63

18y=54

y=3

put y in X+y=7

X=7-3

X=4

put these no. in original no= 10x+y

10(4)+3

43

the no. is 43