Subject: General Aptitude · Chapter: Problems on Numbers · Exam: · Marks: · Difficulty:
The difference between a two-digit number and the number obtained by interchanging the two digits is
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.
Explanation
Let the ten’s digit be x and unit’s digit be y. Then, (10x + y) – (10y + x) = 63 ⇔ 9 (x – y) = 63 ⇔ x – y = 7. Thus, none of the numbers can be determined.
Explanation as extracted from the printed page; notation may be imperfect.