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?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

What part of the chicken has the most feathers?

What can you catch but never throw?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Can you solve below mathematical equation?

2^1234 - 2^1233