COOP Logical Reasoning Flashcards

Five friends stand in a line. Tom is third. Sara is behind Tom. Where is Sara?

Answer: Fourth or fifth

Behind Tom (who is third) means Sara is in position 4 or 5.

If it takes 3 workers 6 hours to complete a job, how long will it take 6 workers to complete the same job?

Answer: 3 hours

Doubling the workers halves the time: 6 ÷ 2 = 3 hours.

Which statement is the opposite of 'All birds can fly'?

Answer: At least one bird cannot fly

The opposite of 'all' is 'at least one exception,' so at least one bird cannot fly.

A box contains red and blue balls. There are twice as many red balls as blue balls. If there are 6 blue balls, how many balls are there in total?

Answer: 18

Red balls = 2 × 6 = 12; total = 12 + 6 = 18.

Which shape has exactly 4 equal sides and 4 right angles?

Answer: Square

A square has 4 equal sides and 4 right angles, unlike rectangles (sides not equal) or rhombuses (no right angles).

Every even number greater than 2 can be written as the sum of two prime numbers. Which is true for 10?

Answer: 10 = 3 + 7

3 and 7 are both prime numbers, and 3 + 7 = 10.