I am a 4-digit number. My first digit is one-third of my second digit. My third digit is the sum of my first two digits. My fourth digit is equal to my second digit. The product of all four digits is 576. What number am I?
2686
Let the first digit be d. The digits are d, 3d, 4d, and 3d. Testing d = 2 yields digits 2, 6, 8, and 6. Their product is 2 * 6 * 8 * 6 = 576.
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: Hard. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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