A Simple Puzzle that Stumped Many of the Brightest Minds – Can You Solve It?

2016-05-11 00.36.43

Yesterday, my friend gave me this interesting puzzle, which he said was one of the most difficult interview questions he had seen.

I immediately gave 30 as the answer, but he said that it was wrong.

Can you figure out the trick? 😀

P.S. I will be revealing the answer very soon, so stay tuned! In the meantime, feel free to post your answers below!

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