<PRE><B>Question 865571</B>
Nurse Levin added 50mL of dextrose to 1.8 liters of intravenous fluid but the doctor said a 10% concentration of dextrose is needed. Find the amount of dextrose that the nurse should add.

The answer listed is 150mL but I cant figure out how they got it.&lt;pre&gt;
1.8 L = 1,800 mL

Let additional amount of dextrose needed be D
Total amount of dextrose =    10% of ENTIRE MIXTURE (equation thus formed)
Then:         50 + D     =   .1(50 + 1,800 + D)
              50 + D     =   .1(1,850 + D)
              50 + D     =    185 + .1D
             D - .1D     =    185 - 50
                 .9D     =    135
D, or additional amount of dextrose = {{{135/.9}}}, or {{{1350/9}}}, or {{{highlight_green(150)}}} mL</PRE>