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OpenStudy (anonymous):
How many kg of pure salt must be added to 8 kg of a 30% solution to obtain a 35% soltution? Round to the nearest tenth.
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OpenStudy (amistre64):
8(.30-.35)/(1-.35); maybe, and drop the sign
OpenStudy (anonymous):
Thanks OOOOOH
OpenStudy (amistre64):
is it right? cause I cant tell yet
OpenStudy (anonymous):
I don't know
OpenStudy (amistre64):
well, its help if you knew how to know :) let me dbl chk it
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OpenStudy (amistre64):
a(-.35) + 8(-.35) = b(-.35) a(1) + 8(.30) = b(.35) ------------------------- a(1-.35) + 8(.30-.35) = 0 a = -8(.30-.35)/(1-.35)
OpenStudy (amistre64):
it should be good, first one goes negative but i knew that lol
OpenStudy (amistre64):
8/13 i believe is what the simplifies to
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