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

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

Two men are in a desert. They both have packs on. One of the guys is dead. The guy alive has his pack open, and the guy who is dead has his pack closed. What is in the pack?

What does below chemistry rebus means?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?