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Math and logic riddle thread
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 7:24 am
tothepoint wrote:
Y Cindy? I think Barbara

I think Barbara is the quickest worker actually
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 7:26 am
Quickest worker is Barbara
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 7:26 am
Cindy is the slowest
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 7:28 am
malki2 wrote:
Cindy is the slowest

Agree but how you got that answer?
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 7:28 am
But you don’t need to know any of that to solve the problem.
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  tothepoint  




 
 
    
 

Post Tue, Oct 13 2020, 7:30 am
I’m blank as how to go about solving this Scratching Head
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  tothepoint  




 
 
    
 

Post Tue, Oct 13 2020, 7:31 am
ExtraCredit wrote:
I think Barbara is the quickest worker actually


Oh sorry misread the question
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 7:31 am
Assume a number of widgets that needs to be produced. Say 120. So...
A+B=40/hr
B+C=30/hr
A+C=20/hr
Adding...
2A + 2B + 2C = 90/hr
Ergo...
A+B+C=45/hr
120/45=2-2/3 hr= 2 hr 40 min
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 7:33 am
malki2 wrote:
Assume a number of widgets that needs to be produced. Say 120. So...
A+B=40/hr
B+C=30/hr
A+C=20/hr
Adding...
2A + 2B + 2C = 90/hr
Ergo...
A+B+C=45/hr
120/45=2-2/3 hr= 2 hr 40 min

Silly Silly
Never mind!
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 7:34 am
ExtraCredit wrote:
Silly Silly
Never mind!


It’s just math...
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 7:35 am
malki2 wrote:
It’s just math...

Not the type I enjoy Can't Believe It
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 8:56 am
To figure out the individual rates, just write each worker in terms of C. So B=30-C and A=20-C. So if A+B+C=45, then
(20-C) + (30-C) + C = 45
Solve for C and you get C=5 per hour.
So A = 15 per hour and B = 25 per hour
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 9:39 am
malki2 wrote:
To figure out the individual rates, just write each worker in terms of C. So B=30-C and A=20-C. So if A+B+C=45, then
(20-C) + (30-C) + C = 45
Solve for C and you get C=5 per hour.
So A = 15 per hour and B = 25 per hour

Feeling beat up
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 10:12 am
ExtraCredit wrote:
Feeling beat up


🤓
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 10:13 am
malki2 wrote:
🤓

Come on I need something good and hard but doable.
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dankbar  




 
 
    
 

Post Tue, Oct 13 2020, 10:22 am
I was good at solving allgebra equations in hi school but forgot the formulas already & don't know how to apply them irl these days
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 10:28 am
ExtraCredit wrote:
Come on I need something good and hard but doable.


Ok here’s something:

To what food do you do the following, in the following order?
1. Throw away the outside
2. Cook the inside
3. Eat the outside
4. Throw away the inside
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 10:32 am
malki2 wrote:
Ok here’s something:

To what food do you do the following, in the following order?
1. Throw away the outside
2. Cook the inside
3. Eat the outside
4. Throw away the inside

Hidden: 

Corn on the cob

Hurray. Now go a few levels higher.
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  malki2  




 
 
    
 

Post Tue, Oct 13 2020, 10:51 am
Diophantus (father of Algebra) had the following riddle written about his life:

Diophantus’s youth lasted 1/6 of his life. He had his first beard in the next 1/12 of his life. At the end of the following 1/7 of his life, he got married. Five years from then his son was born. His son lived exactly 1/2 of Diophantus’s life. Diophantus died 4 years after the death of his son. How long did Diophantus live?
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  ExtraCredit  




 
 
    
 

Post Tue, Oct 13 2020, 11:05 am
malki2 wrote:
Diophantus (father of Algebra) had the following riddle written about his life:

Diophantus’s youth lasted 1/6 of his life. He had his first beard in the next 1/12 of his life. At the end of the following 1/7 of his life, he got married. Five years from then his son was born. His son lived exactly 1/2 of Diophantus’s life. Diophantus died 4 years after the death of his son. How long did Diophantus live?

Ok now this is hard but doable. Thanks! Let’s see...
Hidden: 

I think 68/34 but it’s an estimate


Last edited by ExtraCredit on Tue, Oct 13 2020, 11:15 am; edited 1 time in total
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