SOLUTION: a certain solution of salt water is 15% salt and weighs 35 pounds. how much salt must be added to produce a solution that is 25% salt

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Question 797407: a certain solution of salt water is 15% salt and weighs 35 pounds. how much salt must be added to produce a solution that is 25% salt
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+.15%2A35+=+5.25+ pounds of salt in solution
Let +x+ = pounds of salt to be added
----------------
+%28+5.25+%2B+x+%29+%2F+%28+35+%2B+x+%29+=+.25+
+5.25+%2B+x+=+.25%2A%28+35+%2B+x+%29+
+5.25+%2B+x+=+8.75+%2B+.25x+
+.75x+=+8.75+-+5.25+
+.75x+=+3.5+
+x+=+4.667+
4.667 pounds of salt must be added
check:
+%28+5.25+%2B+x+%29+%2F+%28+35+%2B+x+%29+=+.25+
+%28+5.25+%2B+4.667+%29+%2F+%28+35+%2B+4.667+%29+=+.25+
+9.91667+%2F+39.667+=+.25+
+9.91667+=+.25%2A39.667+
+9.91667+=+9.91667+
OK