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Qhow many gallons of a 90% antifreeze solution must be mixed with 90 gallons of 15% antifreeze to get a mixture that is 80% antifreeze

how many gallons of a 90% antifreeze solution must be mixed with 90 gallons of 15% antifreeze to get a mixture that is 80% antifreeze?

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#1PebblesAnswered at 2013-02-27 03:53:11
------ Percent ---------------- quantity Antifreeze 15 ----------------90 Antifreeze 90 ----------------x Total 80 ---------------- 90 + x 15*90+90*x=80(90+x) 1350+90x=7200+80x 90x-80x =7200-1350 10x=5850 /10 x=585 gallons 90 % Antifreeze
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how many gallons of a 90% antifreeze solution must be mixed with 90 gallons of 15% antifreeze to get a mixture that is 80% antifreeze

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