I am soft and cuddly that soothe your heart. But, If you pick my last name I am going to tear you all apart. Who am I?

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?

Can you solve this picture maths equation?

What four weights can be used to balance from 1 to 30 pounds?

In a basket of apples,
when counted in twos, there was one extra
when counted in threes, there were two extra when counted in fours, there were three extra
when counted in fives, there were four extra
when counted in sixes, there was five extra.

However, if the apples were counted in sevens, no extra apple was left. Can you calculate the minimum number of apples that were present in the basket?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

If 21x = 79x, what is the value of x?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

I cannot talk, but I always reply when spoken to. What am I?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?