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

Using eight eights and addition only, can you make 1000?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

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

How can you drop a raw egg from a height onto a concrete floor without cracking it?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?