Grade 9 Logic Puzzles Worksheet

Grade 9 Logic Puzzles

Read each logic puzzle carefully and use deductive reasoning to find the solution. Show your work or explain your thought process where indicated.

1. Four friends, Alice, Bob, Carol, and David, each have a different favorite color: blue, green, red, and yellow. Use the clues below to determine each friend's favorite color.

Clues:

a. Alice does not like red or yellow.

b. Bob likes blue.

c. Carol does not like yellow.

Explain your reasoning and state each friend's favorite color.

2. Complete the sequence by identifying the pattern: 2, 5, 10, 17,  , 37,  .

The pattern is:  

3. In a row of five houses, each of a different color, lives five people of different nationalities, each owning a different pet, and drinking a different drink. The Brit lives in the red house. The Swede has a dog. The Dane drinks tea. The green house is immediately to the left of the white house. The green house owner drinks coffee. The person who owns birds lives in the yellow house. The owner of the middle house drinks milk. The Norwegian lives in the first house. The person who smokes Blends lives next to the one with cats. The person who has a horse lives next to the person who smokes Dunhill. The owner who smokes Bluemasters drinks beer. The German smokes Prince. The Norwegian lives next to the blue house. The person who smokes Blends has a neighbor who drinks water. Who owns the fish?

4. True or False: If there are 3 apples and you take away 2, you have 1 apple.

5. You are on an island where there are two types of people: Knights, who always tell the truth, and Knaves, who always lie. You meet two inhabitants, A and B. A says, "B is a Knight." B says, "A and I are of opposite types." What are A and B?

Match each riddle with its correct answer.