Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Count the number of triangles in the below picture?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

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

I am sure no one can have two things for dinner. what are they?

A person was killed at a house party. When the police arrive, there are six people present in the house who are the friends of the victim. The name of the friends is Rohit, Aman, Nick, Gagan, and Randy.

Near the dead body, they find a few numbers written with blood by the victim on the floor. The numbers are 8, 5, 4, and 11.

The police arrests one of the friends for the murder. Whom did they arrest and why?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?