VeritasPrepKarishma wrote:
Quote:
The ratio of alcohol and water in three mixtures of alcohol and water is 3:2, 4:1, and 7:3. If equal quantities of the mixture are drawn and mixed, the concentration of alcohol in the resulting mixture will be?
A)65%
B)70%
C)75%
D)80%
how can the following problem be solved using the scale/ratio formula method?
This is how i did it.
Most helpful tip in this question is that all the three mixtures are in equal quantities.
just add the alcohol parts and divide by the total parts.
i.e mixture 1 has 3 parts alcohol out of 5 parts solution
mixture 2 has 4 parts alcohol out of 5 parts solution.
mixture 3 has 7 parts alcohol out of 10 parts solution (can be written as 3.5 parts alcohol out of 5 parts solution)
alcohol=3+4+3.5=10.5 parts
total=15 parts
concentration= 10.5/15*100=70%
ANS = B. SIMPLE!
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