Why is 6 afraid of 7?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Replace the question mark with the number below given a simple math problem.

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

People put me on the table and cut me but do not eat me. What am I?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?