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OpenStudy (anonymous):
how much 5% acid must be mixed with 15% acid to obtain 800ml of 7% acid
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OpenStudy (amistre64):
x+y = 800; y = 800-x x(.05) + y(.15) = 800(.07)
OpenStudy (amistre64):
or x = 800-y :)
OpenStudy (amistre64):
40 -.05y + .15y = 56 .10y = 16 y = 160; 160ml (15%) x = 800-160 = 640(5%)
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