SOLUTION: I have 2.25 litres of antifreeze.. I need to make the mixture 70% antifreeze, 30% water.. how much water do i add?

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Question 927298: I have 2.25 litres of antifreeze.. I need to make the mixture 70% antifreeze, 30% water.. how much water do i add?
Found 2 solutions by josmiceli, brysca:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +w+ = liters of water to be added
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+2.25+%2F+%28+w+%2B+2.25+%29+=+.7+
+2.25+=+.7%2A%28+w+%2B+2.25+%29+
+2.25+=+.7w+%2B+1.575+
+.7w+=+.675+
+w+=+.9643+
You need to add .9643 liters of water
check:
+2.25+%2F+%28+w+%2B+2.25+%29+=+.7+
+2.25+%2F+%28+.9643+%2B+2.25+%29+=+.7+
+2.25+%2F+3.2143+=+.7+
+2.25+=+2.25001+
close enough

Answer by brysca(112) About Me  (Show Source):
You can put this solution on YOUR website!
solution posted below
.
hope this helps!