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What is 5x-4x?

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Anonymous

∙ 12y ago
Updated: 8/23/2021

5x-4x = 1

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Ozella Dooley ∙

Lvl 10
∙ 3y ago
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How many liters of a 10 percent alcohol solution must be mixed with 80 liters of a 80 percent solution to get a 50 percent solution?

The following solution is just an approximation, in practical circumstances sufficient to use. The addendum explains why.x = number of litres (10%) to be added. You have 64 litres of alcohol in your original 80 litres.64 + x/10 = (80 + x)/2640 + x = 400 + 5x4x = 240x = 60 and alcohol content (10%) will be 6.so you will have a total of 140 litres of which 64 + 6 will be alcohol.Added noteto deal with the so called 'dilution contraction' of total volumeIf it were % by MASS ( %m/m), it's quite easy to do (based on the 'Mass Conservation Law). You calculate with mass (kg) and mass-% (%m/m) i.s.o. volume (L) and vol% (%v/v).However if the meaning was: % by Volume ( %v/v) then calculation appears to become quite complicated, but not impossible if you know at least the density values of all solutions (original 80%v/v or 10%v/v and final 50%v/v).DO NOT use: (orig. volume) + (added volume) = final volume, as done above, if exact figures are necessary.It's only a rule of thump, an approximation. This is because fluids can contract on mixing at dilution. There is no rule such as: conservation of volume.Your case: 60 L + 80 L (is not equal but) < 140 L final solution.


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