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!!!

How many Watermelons are there in the below picture?

Can you count the number of squares in the figure below?

Take one out and scratch my head, I am now black but once was red. What am I?

Rearrange the letters in "new door" to make one word.

The centre of the third figure is empty. What digit should fit inside?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?