In which direction should the missing arrow point?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

How can you make number one disappear by adding something to it?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

What occurs twice in a week, once in a year but never in a day?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)