Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

A woman is sitting in her hotel room and hears a knock at the door. She opens the door to see a man whom she’s never met before. He says, “I’m sorry, I have made a mistake, I thought this was my room.” He then goes down the corridor and into the elevator. The woman goes back into her room and calls security. What made the woman so suspicious of the man?

What number do you get when you multiply all of the numbers on a telephone's number pad?

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

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?