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Tug of War (Posted on 2006-01-27) Difficulty: 2 of 5
Chuck can barely defeat, by himself alone, Sylvester and Steven together.

Sylvester and Chuck are a perfect match for Arnold and Steven.

But if Chuck and Arnold exchange places, Sylvester and Arnold together can decisively beat Chuck and Steven.

Who is stronger, who is weaker?

See The Solution Submitted by Federico Kereki    
Rating: 1.6667 (6 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution Thinking Algebraically (Spoiler) | Comment 6 of 12 |

Let R=Rocky (Sylvester), C=Chuck, A=Arnold, S=Steven

We are given:
1)   C > R + S
2)   R + C = A + S
3)   R + A > C + S

From 1) we have

C > R 
C > S

Adding C to both sides of 3) we get
R + C + A > C + C + S

We can replace "R + C" with "A + S" based on 2), so we have
A + A + S > C + C + S

Subtracting S from both sides and dividing by 2 gives us

A>C

Now all we need is to know which is greater:  R or S

Adding R + S to both sides of 3) we get
R + A + S + R > S + R + C + S

From 2) we see we can subtract A + S from the left side of this equation and simultaneously subtract R + C from the right side.  Then, dividing both sides of the equation by 2 leaves us with

R > S

Putting our results together we have

A > C > R > S

So, from strongest to weakest:

Arnold, Chuck, Sylvester, Steven.

 


  Posted by Mindrod on 2006-01-28 11:53:06
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