Grade 12 Logic Puzzles Worksheet
A worksheet designed for Grade 12 students to practice and enhance their logical reasoning and problem-solving skills through various logic puzzles.
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Grade 12 Logic Puzzles
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Read each logic puzzle carefully and use your reasoning skills to solve them. Show your work or explain your thought process where appropriate.
1. You are in a room with two doors. One door leads to freedom, the other to certain doom. There are two guards, one who always tells the truth and one who always lies. You don't know which guard is which. You can ask only one guard one question. What single question can you ask to determine which door leads to freedom?
2. In a standard 9x9 Sudoku grid, each row, each column, and each of the nine 3x3 subgrids must contain all of the digits from 1 to 9. If a particular cell can only contain the digit 7 based on the existing numbers in its row, column, and 3x3 subgrid, this is an example of a deduction. The process of eliminating possibilities for a cell is called .
Match the riddle with its answer.
1. What has an eye but cannot see?
a. A river
2. What is full of holes but still holds water?
b. A needle
3. What question can you never answer yes to?
c. Are you asleep yet?
4. What has cities, but no houses; forests, but no trees; and water, but no fish?
d. A sponge
5. What is always in front of you but can’t be seen?
e. The future
6. What goes up but never comes down?
f. Your age
4. On an island, there are two types of inhabitants: Knights, who always tell the truth, and Knaves, who always lie. You meet two inhabitants, A and B. A says, 'I am a Knave or B is a Knight.' B says, 'A is a Knave.' What are A and B?
A is a Knight, B is a Knight
A is a Knight, B is a Knave
A is a Knave, B is a Knight
A is a Knave, B is a Knave
5. A farmer needs to cross a river with a fox, a goose, and a bag of corn. The boat can only carry the farmer and one other item. If left alone, the fox will eat the goose, and the goose will eat the corn. How can the farmer get all three across the river safely?
6. True or False: If a statement is a tautology, its negation is a contradiction.
True
False
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