Which alphabet letter is a question?

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

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?

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.

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?