Solve the alphametic puzzle by replacing the alphabet with the number.

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My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?

Replace the question mark with the correct number in the below-given picture?

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

O T T F F S S ?

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

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?