An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

What is the next number?

77, 49, 36, 18 ?

Which is the smallest number that you can write using all the vowels exactly once?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

What is the next number in the series?

15 29 56 108 208 ?