Question

the sum of the digits of a 2-digit number is 15. The number obtained by reserving the digits is 9 less than the original number. Find the number.

Answer 1

X plus Y = 15
Y plus X = 15-9
Therfore
15=15-9
0=-9
0=9
0/9=9/9
0=1
Hence provved

Answer 2

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