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Man Stumps His Girlfriend With This Math Riddle – Can You Solve It?

April 3, 2016 - By Jenna Lorraine

This video of a man quizzing his girlfriend with a simple math riddle went viral after he uploaded the exchange to YouTube.

The riddle?

“A big brother is four years old. A little brother is half his age. How old will the little brother be when the big brother is 100?”

Now, in this instance the girlfriend falls immediately into the intended logic trap that if the little brother is half the older brother’s age he must be 50 years old when his brother is 100.



What is more astonishing is how confident she remains in her answer after time-and-time again her boyfriend indicates it is incorrect and retells the riddle.

In fact they go through her entire reasoning several times before she finally concedes and asks him for the correct answer.

“I think you’ve got this wrong,” she puzzles, until finally realization dawns: “Oh I get it!”



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