9514 1404 393
Answer:
d. 45
Step-by-step explanation:
You can check the offered answers. You will find that the difference from reversing the digits will only be 9 if the digits differ by 9/9 = 1.
The original number is 45.
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<em>Check</em>
45 + 9 = 54 . . . with the digits reversed
The answer is A
21
31-2=X+6
29=X+6
29-6=X
23=X