Number System
The difference between a two-digit number and the number obtained after interchanging its two digits is 36. The sum of the two digits of the number is 12. Find the lowest such possible number.

50
47
48
49

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Number System
The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?

96
Cannot be determined
69
78

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