When 99 is considered higher than 100?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

How can you tell a raw egg from a hard-boiled egg?

A river should be crossed by a father, a mother and their two sons and two daughters.
There are some rules that should be followed while crossing the river. There can be only two people in the raft while crossing. The daughters cannot be with their father unless there is the presence of the mother. The sons cannot be with their mothers unless the father is present. Unless the guard is on the board, the criminals cannot be with any of the family members. Only the adults like the father, the guard, and the mother knows to use the raft.

How will they cross the river?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

What breaks yet never falls, and what falls yet never breaks?