Games Need To Solve

Four Adventurers and a Small Canoe
Four adventurers (Alex, Brian, Cassie, and Dylan) need to cross a river in a small canoe. The canoe can only carry 100 kg. Alex weighs 90 kg, Brian weighs 80 kg, Cassie weighs 60 kg, and Dylan weighs 40 kg, and they have 20 kg of supplies. How do they get across?

Farmer Crosses River
A farmer wants to cross a river and take with him a wolf, a goat, and a cabbage. There is a boat that can fit himself plus either the wolf, the goat, or the cabbage. If the wolf and the goat are alone on one shore, the wolf will eat the goat. If the goat and the cabbage are alone on the shore, the goat will eat the cabbage. How can the farmer bring the wolf, the goat, and the cabbage across the river?

Crates of Fruit
You are on an island and there are three crates of fruit that have washed up in front of you. One crate contains only apples. One crate contains only oranges. The other crate contains both apples and oranges. Each crate is labeled. One reads “apples”, one reads “oranges”, and one reads “apple and oranges”. You know that NONE of the crates have been labeled correctly. They are all wrong. If you can only take out and look at just one of the pieces of fruit from just one of the crates, how can you label ALL of the crates correctly?

Girl and Boy
A boy and a girl are talking.
“I am a boy,” said the child with red hair.
“I am a girl,” said the child with the brown hair.
At least one of them lied. Who is the boy and who is the girl?

Knights and Knaves
There are three people (Andy, Billy, and Chas), one of whom is a knight, one a knave, and one a spy. The knight always tells the truth, the knave always lies, and the spy can either lie or tell the truth.
Andy says, “Chas is a knave.”
Billy says, “Andy is a knight.”
Chas says, “I am the spy.”
Who is the knight, who the knave, and who the spy?