Alright, I have rubbing alcohol that is 70% and I want to add water to it so it is 50/50. If I have 1/2 cup of alcohol, how much water do I need?
Answer:
Let x cup of water is needed.
Therefore,
0.70*0.5=0.50(0.5+x)
or,0.35=0.25+0.50x
or,0.10=0.50x
x=0.10/0.50
=0.20
Therefore 0.20 or 1/5 cup of water is to be mixed
7/10 of a cup
M1V1 = M2V2
(.70)(.5 cup) = (.50)(x)
x = 7/10 cup
70% pure + ? = 50%pure
50-70= negative 20
20 % water + 70% guessing
about 33 percent of 1/2 cup
Dont mix them just drink & enjoy.
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