What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

A river should be crossed by a father, a mother and their two sons and two daughters.
There are some rules that should be followed while crossing the river. There can be only two people in the raft while crossing. The daughters cannot be with their father unless there is the presence of the mother. The sons cannot be with their mothers unless the father is present. Unless the guard is on the board, the criminals cannot be with any of the family members. Only the adults like the father, the guard, and the mother knows to use the raft.

How will they cross the river?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Joseph buys three kinds of chocolates for 100 rupees. The first one is priced at 5 rupees, second one at 3 rupees and third one at 0.5 rupees.

If he bought 100 chocolates in total, how many pieces do you think he bought each chocolate?

Replace the question mark with the correct number in the below-given picture?

Why Aeroplane windows are round?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.