How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?

Can you tell a 3D object that has just two surfaces?

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

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.

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

What does this rebus riddle means ?

Complete the given grid with valid words. You can only use the letters AAEEIIMMPPTT.

Hint: The grid reads the same across as down.

John is the son of Jacob.
So,
Jacob is the_____of John's father?

There are forty elephants and they have forty-fore heads. How can this be possible?