SOLUTION: 7 qt of a saline solution was mixed with 4 qt of pure water to make 35% saline solution. Find the percent concentration of the first solution.

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Question 1026967: 7 qt of a saline solution was mixed with 4 qt of pure water to make 35% saline solution. Find the percent concentration of the first solution.
Found 2 solutions by josgarithmetic, josmiceli:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The description is meaningless.

7p%2F%287%2B4%29=35
7p%2F11=35
p=35%2811%2F7%29
p=5%2A11
p=55, percent-------------which is impossible for "saline solution".

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = quarts of salt in original saline solution
After adding +4+ quarts of water:
+x+%2F+%28+7+%2B+4+%29+=+.35+
+x+%2F+11+=+.35+
+x+=+3.85+
--------------
+x%2F7+=+3.85%2F7+
+x%2F7+=+.55+
The concentration of the 1st solution in 55%