Drukarki » Chemistry http://www.drukarki.rybnik.pl Printers Drivers Fri, 30 Apr 2010 20:21:09 +0000 http://wordpress.org/?v=2.9.1 en hourly 1 How much pure water must be mixed with 9 pints of 70% developer to produce the mixture he needs? http://www.drukarki.rybnik.pl/how-much-pure-water-must-be-mixed-with-9-pints-of-70-developer-to-produce-the-mixture-he-needs.php http://www.drukarki.rybnik.pl/how-much-pure-water-must-be-mixed-with-9-pints-of-70-developer-to-produce-the-mixture-he-needs.php#comments Wed, 03 Feb 2010 08:10:53 +0000 printer http://www.drukarki.rybnik.pl/how-much-pure-water-must-be-mixed-with-9-pints-of-70-developer-to-produce-the-mixture-he-needs.php
NancyFrances asked:


Nick DiGregorio is developing film in his darkroom when he realizes he does not have the proper developer. He needs a mixture that is 20% developer, but he only has a mixture that is 70% developer. How much pure water must be mixed with 9 pints of 70% developer to produce the mixture he needs? Round your answer to the nearest hundredth when necessary.

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