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Logical Thinking and Problem Solving Flashcards

6 cards from real OC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Logical Thinking and Problem Solving flashcards as text

  1. A shop has a 'buy 2 get 1 free' offer. If items cost $9 each and you want 6 items, how much do you pay?

    Answer: $36

    With buy 2 get 1 free, you pay for 4 out of 6 items: 4 × $9 = $36.

  2. Sam thinks of a number, doubles it, adds 10, and gets 30. What was the original number?

    Answer: 10

    Work backwards: 30 − 10 = 20, then 20 ÷ 2 = 10.

  3. If the code for CAT is 3-1-20 (C=3, A=1, T=20), what is the code for DOG?

    Answer: 4-15-7

    D=4, O=15, G=7, so the code is 4-15-7.

  4. A 10-litre tank is one-quarter full. How many litres are needed to fill it?

    Answer: 7.5

    One-quarter of 10 = 2.5 litres already in the tank; 10 − 2.5 = 7.5 litres needed.

  5. Alex, Ben, and Carla each have a different pet: a cat, a dog, and a fish. Alex does not have the cat. Ben does not have the dog. Carla has the fish. Who has the cat?

    Answer: Ben

    Carla has the fish; Alex cannot have the cat, so Alex has the dog and Ben has the cat.

  6. How many rectangles (including squares) are in a 2×3 grid of squares?

    Answer: 18

    Count all possible combinations of rows and columns: C(3,2)×C(4,2) = 3×6 = 18 rectangles.

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