I am a two-digit number. My tens digit is three times my units digit, and the sum of my digits is 12. What number am I?
Category: Math · Difficulty: hard
Hint: Let the unit digit be x and find the tens digit.
Answer
39
Explanation
Let the units digit be x, so the tens digit is 3x. The equation 3x + x = 12 gives x = 3, making the number 39.
This is a hard math riddle — a tricky one that takes a little thought. The answer is 39.
More Math riddles
- I return to my start, yet shift with each cycle. What am I?
- I am repeated, yet never heard, and always even. What am I?
- I can be squared, and my sum is neat, a single digit turns into twelve feet. What am I?
- I am a total that comes from three, add me to two, and you'll see. What am I?
- I am a trio where one is odd, add me to two, and a double is flawed. What am I?
- I am a pair that comes in hand, triple me, and together we stand. What am I?
- I am a digit that can change, one less than twelve, yet never strange. What am I?
- I am flat yet can create depth, I can be whole or just a part. What am I?