A Potions Puzzle

Alpha Squad2
Topic: Logic
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A Potions Puzzle. Problem # 167. Video best viewed in dim light.

Three explorers enter a cave, planning on having a good time, but soon get lost in the endless darkness. After following a glowing light, they see in front of them a thousand bottles, and are asked a riddle. If they solve it correctly, they will escape. But if they solve it wrong, they will be trapped inside for ever.

Common Core Standards: SMP
Problem #: 
167 (2017-2018)
Problem Difficulty Level: 6 [?]