Can you place three balls such that the equation shown in the picture holds true?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

Which is the correct shadow of the bird?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

What number divided by 4 is the same as that number minus 4?

When we see 2 but call 10?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?