If you prepare 500 ml of 12.5% dextrose using D10W and D20W, how much is needed
Let a= amount of D10W and b = amount of D20W
a+ b =500 [500ml is total]
0.1 a + 0.2 b = 62.5 [ total amount of dextrose must be the same]
multiply 2nd equation by 10: a + 2b = 825
and a + b = 500
subtracting gives b = 125
and a = 375 [a+b =500]
use 375 ml of D10W and 125 ml of D20W
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