Question 883542
 I have a bag of zinc powder i have to mix with liquid binder the ratio is 77% liquid to 23% powder.
 The total bag of powder mixed with liquid makes 20 litres
I need to mix batches of 2 or maybe 3 litres at a time.
 How do i calculate. I know i must obviously weigh the whole bag of powder first.
:
The problem here is liters is a volume measurement, so the amt of zinc should be volume also. Instead of weighing the bag of zinc find it's volume by pouring a bag of it in a container that measures it's volume in liters
:
Calculate how many liters of binder are required for one bag to give 23% Zinc
:
let z = vol of the bag of zinc in liters
let b = amt of binder required in liters
An equation based on the percent of zinc
.23(z+b) = z
Solve for b
Divide both sides by .23
z + b = {{{z/.23}}}
b = {{{z/.23}}} - z
b = {{{(z-.23z)/.23}}}
b = {{{(.77z)/.23}}}
b = 3.348z
:
 multiply the vol of one bag by 3.35 and add that amt of binder to it.
The total will be the two volumes added together