jessetoronto wrote:
Some times I wonder if I should have Hermione Obliviate all Mixture memory and learning I have since beginning to study and start over!!! The easy ones are getting harder...ahhh
For any mixture problem in GMAT, please use the alligation technique:
trigger points:
From any mixture problem, note down the below 3 pointers first.
1) What is solution 1
2) what is solution2
3) what is the resulting solution
For example, i have a solution with 40% milk (==> rest i.e. 60% is water) and i have one more solution which is with 70% milk ==> 30% water
qtn: if we mix these two solutions in a particulr ratio to get a resultant solution with 50% milk, how much % solution1 exists in the resultant solution?
40------------70
------50
20------------10 ==> use the solution 1 and solution2 in the ratio 2:1 to get a resultant solution with 50% milk
means if i use 200liters of sultion 1, then i have to use 100liters of solution 2 resulting 300liters of 50%milk..hope it is clear.
Back to the Original qtn:
solution1: water ==> 100% water
solution2: 24% alcohol ==> 76% water
resulting solution - alcohol concentarion is decreased by 1/3 ==> 24 - 24*1/3 = 16% alcohol==> 84% water
100------------76
-------84
8--------------16 ==> water:24%-alcohol solution = 1:2
OR
solution1: water ==> 0% alcohol
solution2: 24% alcohol
resulting solution - alcohol concentarion is decreased by 1/3 ==> 24 - 24*1/3 = 16% alcohol
0------------24
-------16
8------------16 ==> water:24%-alcohol solution = 1:2
(SAME AS ABOVE)
given that 200liters of water ==> 2*200 = 400 liters of 24%-alcohol solution
ANSWER "E".
Regards,
Murali.
Kudos?