I’m tall when I’m young, and I’m short when I’m old. What am I?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

What is next number in the pattern below:

131 517 192 123 ?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

What is black when you buy it, red when you use it, and gray when you throw it away?

What is the word or phrase?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

Count the Triangle in the figure given below:

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?