Cognitive Reflection Classic Numerical Reasoning Problems Questions and Answers

Question 1

A bat and a ball cost $1.10 in total. The bat costs $1.00 more than the ball. How much does the ball cost?

Accepted Answer

$0.05

Answer

$0.10

Answer

$1.00

Answer

$0.50

Question 2

If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?

Accepted Answer

5 minutes

Answer

100 minutes

Answer

20 minutes

Answer

1 minute

Question 3

In a lake, there is a patch of lily pads that doubles in size every day. If it takes 48 days for the patch to cover the entire lake, on which day does the patch cover half of the lake?

Accepted Answer

Day 47

Answer

Day 24

Answer

Day 36

Answer

Day 12

Question 4

A sock drawer contains 10 black socks and 10 white socks, all mixed together. You are pulling socks out in the dark. Which of the following is the minimum number of socks you must pull to guarantee you have a matching pair?

Accepted Answer

3

Answer

11

Answer

2

Answer

20

Question 5

A two-volume set of books is on a shelf in correct order (Vol. 1, Vol. 2). Each cover is 1/8 inch thick, and the pages of each book are 1 inch thick. A bookworm starts on the first page of Volume 1 and eats in a straight line to the last page of Volume 2. What is the total distance the bookworm travels?

Accepted Answer

1/4 inch

Answer

2 1/4 inches

Answer

2 inches

Answer

0 inches

Question 6

A father is twice as old as his son. Twenty years ago, the father was four times as old as his son. What is the son's current age?

Accepted Answer

30

Answer

60

Answer

40

Answer

25

A bat and a ball cost $1.10 in total.The bat costs $1.00 more than the ball.How much does the ball cost?

A bat and a ball cost $1.10 in total.
The bat costs $1.00 more than the ball.
How much does the ball cost?