Question

Marcia a lab technician needs three liters of an 8% saline solution. She has a 5% and 9% solution in the lab stock room. How many liters of the 5% and 9% solution should she mix. (slove using linear systems)

Answer 1

i hope she should mix 2.25lt of 9% solution and .75lt of 5% solution

Answer 2

What equations did you use to get that

Answer 3

@harsh314 ?? I know that's the right answer but how??

Answer 4

ok you need the following equations
salinity of the required solution is 8% which means 8lt in100lt
now the volume of solution is 3lt
so the amount of salinity in 3lt is 24/100(i)
let us take x lt from 5% saline solution and y lt from other one
now
salinity in x=5x/100
salinity in y=9y/100
total salinity =(5x+9y)/100(ii)
from (i) and (ii)
5x+9y=24
and as you know the net amount is 3lt
so x+y=3
solve them you get the answers...........

Answer 5

Thank you so much!!!!

Answer 6

my pleasure ................