I am a two-digit prime whose digits add up to 10. If you reverse my digits, you obtain a larger prime that exceeds me by exactly 36. What number was I originally?
37
The number 37 is prime, and its digits sum to 3 + 7 = 10. Reversing the digits yields 73, which is also prime, and 73 - 37 = 36.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Medium. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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