Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

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

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

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

How can you take 2 from 5 and leave 4?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

I don't get anymore wetter, no matter how much rain falls on me.