19. A number consists of 2 digits. Som of the
digits is 9. If 9 is subtracted from the number,
the digits are reversed. Find the number *
(3 Points
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1
Answer:
54
Explanation:
Let the unit's digit be x.
Tens digit = 9-x
Original number = 10 (9-x) + x = 90-9x
After reversing digits,
Units digit = 9-x
Tens = x
New number = 10x+9-x = 9x+9
According to Question,
90-9x-9 = 9x+9
=> 81-9 = 9x+9x
=> 72 = 18x
=> x = 4
Hence, the number is 54.
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