15 Riddles That Will Energize You More Than a Shot of Espresso

Solving tricky riddles is the best exercise for your brain. If you want to keep it sharp and develop some serious analytical skills, practice with riddles like this one. In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long will it take for the patch to cover half the lake?
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