Hard
Hard Logic Riddles
21 XP

The King Coin Problem

19,443 solved 86% solve rate 14% fail rate
A king places 100 coins in a line, some gold side up, some silver. You are blindfolded and must divide them into two groups with equal gold-side-up coins. You can flip coins but cannot feel which side is up. The king tells you 30 are gold-up.
Only 86% solve this correctly
19,443 attempts
Earn +21 XP for solving
Quick Answer & Explanation
Take any 30 coins

The answer to this riddle is Take any 30 coins. Difficulty: Hard · Solved by 19,443 puzzle lovers.

Take any 30 coins into a separate group and flip all of them. If the original group had X gold-up coins out of those 30, now it has 30-X gold-up. The remaining group also has 30-X gold-up.
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