Can you pass this 3 questions quiz?

[Svnla]

No cheating, no Google, no help. Just your brain.

The Cognitive Reflection Test"

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?

2. If it takes five machines five minutes to make five 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?











Answers
1) 5 pence (not 10)
2) 5 minutes (not 100)
3) 47 days (not 24)

In question one, the bat costs £1,00 MORE than the ball. If the ball cost 10p, it would only cost 90p more.

In question two, each machine takes five minutes to make a widget, so 100 machines will take five minutes, just as five machines do.

In question three, the patch doubles every day, so, going backwards in time, it halfs in time every day, hence the lake will be half-covered on day 47.

 

[zinfamous]

sadly, the first one baffled me for 2 minutes too long.

2 and 3 were easy

 

[Mr.IncrediblyBored]

The limit does not exist?

 

[R0H1T]

I don't remember cricket bats costing just a pound & 5 pence!

The limit does not exist?

What limit?

 

[GagHalfrunt]

What limit?

The one in question four. That's the real test, if you're not able to put together that question from the clues in the first three you fail.

 

[CalebRockeT]

I couldn't get any of them. Seems I should just kill myself.

 

[BxgJ]

Yes, in less than 10s, though it's because I've seen them before. I don't remember where, I think my daughter was reading something from some site and asked me those questions. They're not hard if you stop to think, and don't blurt out the 'seems obvious (because it's wrong)' answer.

 

[Mr.IncrediblyBored]

What limit?

Exactly.

 

[dullard]

1) What is the package discount when buying the set?

2) Are there any upstream or downstream limitations? For example, can the current employees and/or current conveyor belts actually supply enough raw parts for 100 widgets in just 5 minutes?

3) Do the lily pads grow continually, or does the growth speed increase when there is more energy (such as when the sun is shining)? Also, is it exactly 48 days to be fully covered, or did the observer just notice that it was fully covered on the 48th day that the observer arrived? Also, if the lake is really long and narrow, can lily pads grow faster than the speed of light? Does the doubling of size only occur in the surface of the water, or does it also include possible vertical size increases?

3 Again) What species of water lily? I ask because a single Victoria Amazonica is 7 m^2 in surface area. If it truly doubled in size (horizontally) 48 times, then it would cover more area than the total surface area of the Earth's oceans. I'm skeptical that this lake is really that big.

 

[Denly]

I still don't get why the ball cost 5cents and not 10cents.

 

[dullard]

I still don't get why the ball cost 5cents and not 10cents.

If the ball was £0.10, then the bat (which costs £1.00 more than the ball) would cost £1.10. Total would be £1.20. But the total was supposed to be £1.10.

 

[BD231]

Lies

 

[ElFenix]

I still don't get why the ball cost 5cents and not 10cents.

the pound was decimalized in 1971.

 

[Drako]

I still don't get why the ball cost 5cents and not 10cents.

The key word is "more". Think about it.

 

[Denly]

If the ball was £0.10, then the bat (which costs £1.00 more than the ball) would cost £1.10. Total would be £1.20. But the total was supposed to be £1.10.

dam

 

[WaTaGuMp]

Stupid lame question with wacky foreign moneyz.

 

[Paratus]

I still don't get why the ball cost 5cents and not 10cents.

This is just like the algebra questions I get to help my kids with.

So
Bat + Ball = 1.10
Ball = X
Bat = X +1

Substituting
X + X+1 = 1.10

Reduce
2X = 1.10 - 1
2X = 0.1
X= 0.05

Solve
Ball = 0.05 pounds
Bat = 1.05 pounds

 

[dullard]

Bat + Ball = 1.10
Ball = X
Bat = X +1

Substituting
X + X+1 = 1.10

I still stick by my original question above, can you actually do this substituting part for this problem?

For example: https://www.newegg.com/Product/ComboBundleDetails.aspx?ItemList=Combo.3466726

• Motherboard + CPU = $486.98.
• Motherboard = $159.99: https://www.newegg.com/Product/Product.aspx?Item=N82E16813130973&ignorebbr=1
• You can't just say then that the CPU costs $486.98 - $159.99 = $326.99. This is due to the combo discount. The CPU actually costs $339.99: https://www.newegg.com/Product/Product.aspx?Item=N82E16819117726&ignorebbr=1

Not enough information was given to solve any of the problems.

 

[mindless1]

Surely you guys had tests in high school that were harder than this?

dullard, it's always assumed everything else is a constant unless stated otherwise.

 

[shortylickens]

I still don't get why the ball cost 5cents and not 10cents.

the ball is 5 cents, the bat is a dollar 5. 1.05 plus .05 equals 1.10.
the bat is exactly one dollar more than the ball.

 

[cbrunny]

wtf is a pence? thought that was a dude....

 

[SKORPI0]

Not sure why someone would not understand the word "more".

1 . 5 pence ball + 105 pence bat = 110 pence.

 

[BudAshes]

Do you end up in the "special class" if you can't answer those?

 

[dullard]

I happen to favor the picket fence type of Cognitive Reflection test.

You are building a picket fence with 10 panels. How many posts do you need?

I see that question answered wrong over and over and over again when fixing other people's programming bugs.

 

[brianmanahan]

easy