Question 123322
Let "w" be the watch & "p" be the pen representations.


By the given data: 


2w + 4p = 586   ------------------> Arnold 

1w + 3p = 361   ------------------> Smith


Solving both of the equations simultaneously, we find the value of the pen & the watch. 


2w + 4p = 586

2w + 6p = 722   multiplied by (2)

================  Subtracting them we get:
- 2p = -136 


==> p = 68 


So, by back substitution we can find the value of w, watches. 


1w + 3(68) = 361 

1w = 361 - 204 

w = 157 


thus the cost of one pen is $68 and one watch is $157 


thus the solution.


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