Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

They are three errirs in this question. Can you find them?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

A spy was in Canada trying to steal insider information on how to set up new Maple Syrup factories in their country. He was introduced to the operations manager of the biggest factory in Canada. However, the manager was suspicious and decided to test him with a question before he trusted him. So he asked, “What would you be sure to find in the middle of Toronto?” The spy thought fast and came up with an answer for the manager. What was his answer?

Can you move 2 matchsticks to form four equal sized squares.

What is the word or phrase?

On a bright sunny day, two fathers took their son fishing in the lake. Each man and son were able to catch one fish. When they returned to their camp, there were only three fishes in the basket. What happened?

PS: None of the fish were eaten, lost, or thrown back.

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?