Saturday, October 19, 2013

World's Shortest Intelligence Test


It's called the Cognitive Reflection Test (CRT). Here are the questions:


1) A bat and a ball cost $1.10 in total. The bat costs $1 more than the ball. How much does the ball cost?

2) If it takes 5 machines 5 min to make 5 widgets, how long would it take 100 machines to make 100 widgets?

3) In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?

Don't look until you come up with your answers, but the answer to #1 and #2 are on the ball in the picture to the right.

Check out the link above for more information on this interesting test . . . and the answer to question #3.

5 comments:

Nye Regno Draed said...

heheheh, very nice. Most people don't realize the true meaning of the word problems unless they change it into algebra:
1. X+1= Y
X+y= 1.1
X= ?

2. 5xy/5 = 100xy/100
X=5; Y=?

3. L= 2^D
If D= 48

If L = (2^D)/2; What is L?

Rabia said...

.5
5min
47 days

Peter Weisz said...

To: Rabia. I'm afraid your first answer is incorrect. Point 5 of a dollar is fifty cents. The correct answer is five cents or, expressed decimally, point zero five (.05). The others are correct.

Anonymous said...

at another level, how quickly you come up with the correct answers [assuming you do] is yet another, and sharper, "IQ" test.

math wizards regularly answer questions such as these in mere seconds, using perhaps 15 seconds in all for all three of them.

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