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'Number Detective' printed from http://nrich.maths.org/
Follow the clues to find the mystery number from the list
- The number has two digits.
- Both of the digits are even.
- The digit in the tens place is greater that the digit in the
unit (or ones) place.
- The units (or ones digit) is not in the three times table.
- The tens digit is not double the ones digit.
- The sum of the two digits is a multiple of five.