You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Take one out and scratch my head, I am now black but once was red. What am I?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Why is the Hole below a Lock?

If eleven plus two equals one, what does nine plus five equal?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?

What's the only room from which no one can enter or leave

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?