Question 1026579
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River c is 200 miles longer Than river D.   if the sum of their lengths is 5,550 miles  what is the length of each river?
The length of river c is __ miles , and the length of river D is __ miles. ?
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The condition says that

C + D = 5550,   (1)
C - D =  200.   (2)

Add these two equations (both sides). You will get

2C = 5550 + 200,

2C = 5750,

C = {{{5750/2}}} = 2875 miles.

Having this, can you find D on your own?
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