Why is it very easy to weigh a fish?

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.

Solve the equation in the image by looking at the pattern closely.

Can you find a five letter word that is left with only two letters if one is removed?

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

What is the below Rebus indicate?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?