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?

Which tank will fill first?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Which digit occurred maximum times between the number 1 and 1000?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?

What do you get if you add 2 to 100 four times?

A sundial has the fewest moving parts of any timepiece. Which has the most?

John is pretty weird. He likes toffees but hates chocolates. He loves books but never reads. He likes to build his troops in an online game but does not proceed with the war. He likes to go swimming but is afraid of water.

Seeking this behaviour, can you tell whether he likes balloons and parties?