How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

You can see three almost identical images below. Can you spot the odd one out from them?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

A rain drop fell from one leaf to another leaf and lost 1/4th of its volume. It then fell to another leaf and lost 1/5th of the volume. It again fell on another leaf and lost 1/5th of the volume.



This process kept repeating till it fell on the last leaf losing 1/75th of its volume.



Can you calculate the total percentage of loss from the initial volume when the drop has fallen to the last leaf accurate up to two decimal places?