Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

In the picture given below, can you find out which digit will take place of the question mark?

Can you count the number of triangles in the given picture?

Which country gets ill every time?

How far can you walk into the woods?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

Which Travels Faster? Solve below famous picture riddle:

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?