How do you go from 98 to 720 using just one letter?

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?

What happened when the wheel was invented?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

Trying to tease Birbal, Akbar gave him one gold coin and ask him to buy
* something for him to eat
* something for him to drink.
* something to feed the cows
* something to plant in the garden
and most important you need to buy only one thing.

What must Birbal buy to silence Akbar?

How can you make number one disappear by adding something to it?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Find out the number of circles in the given picture having Illusion

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?