Spot what is wrong here in below Picture?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

In the four images below, can you find the odd one out?

A devotee visits 9 temples when he visits India. All these nine temples have one thing in common - there are 100 steps in every temple. The devotee puts the Re.1 coin after climbing up every step. He does the same while climbing down every step. At each temple, the devotee offers half of his money from his pocket to god. In this way, his pocket becomes empty after he visits the 9th temple.

Can you calculate the total amount he had initially?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

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

which number am I?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?