Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

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

Can you solve the below tricky visual equation?

What has many teeth, but cannot bite?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

What does the below rebus puzzle mean?

There is a straight highway. Four different villages lie on that highway. The distance between them is different. The third village is 60km away from the first village; the fourth is 40 km away from the second; the third is 10 km near to the fourth that it is to the second.

Can you calculate the distance between the fourth and the first village ?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

John was gifted a new Hayabusa. He drove x miles at 55mph. Then he drove x+20 miles at 40mps. He drove his bike for 100 minutes. How much distance did he travel?