Challenging Brain Teasers with Answers

Over the years, I have collected hundreds of brain teasers.

Here are three examples:

Some months have 30 days, some have 31. How many have 28? All of them.

Divide 30 by one-half and add 10. What’s the total? 70

You are driving a city bus. At the first stop, four people get on. At the next step, two get off and seven get on. At the next stop, three get off and two get on. And at the next stop, five get off, and nine get on. What’s the name of the driver?

The answer to the last is located after these more challenging brain teasers, provided at the website:

* * *

Guess the next three letters in the series GTNTL.

I am the beginning of sorrow and the end of sickness. You cannot express happiness without me yet I am in the midst of crosses. I am always in risk yet never in danger. You may find me in the sun, but I am never out of darkness.

A man wanted to work, but he could not log in to his computer terminal successfully. He tried twice, but still his password did not work. He suddenly remembered that the passwords are reset every month for security purposes. So, he called his boss and said, “Hey boss, my password is out of date.”
His boss replied, “Yes, that’s right. The password is different. Listen carefully. I am sure, you can figure out the new one. The new one has the same amount of letters as your old password, but only four of the letters are the same.””Thanks boss.”With that, the man could correctly log into his station. What are both the new and old passwords?

“You’re driving a city bus….”
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