confidential388 confidential388

14-03-2015
Mathematics

Answered

The length of river a is 560 miles more than twice the length of river B. River A is also 1550 miles longer than river B. Find the lengths of river A and B.

Answer :

Jerremiah Jerremiah

14-03-2015

River B is 990 miles and River A is 2,540 miles.

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kiwihugs kiwihugs

14-03-2015

a = 2b + 560
a = b + 1550
----------------------
a - 2b = 560
a - b = 1550
---------------------
a - 2b = 560
-2(a - b = 1550)
------------------------
a - 2b = 560
-2a +2b = -3100
-a = -2540
a = 2540
-----------------------
2540 = b + 1550
2540 - 1550 = b
990 = b

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