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EAMA SUCCESS % QUESTION

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EAMA SUCCESS % QUESTION [#permalink]

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New post 13 Oct 2010, 23:12
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A
B
C
D
E

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Question Stats:

33% (01:54) correct 67% (00:11) wrong based on 6 sessions

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How many liters of a 40% iodine solution need to be mixed with 35 liters of a 20% iodine solution to
create a 35% iodine solution?
a. 35
b. 49
c. 100
d. 105
e. 140
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Re: EAMA SUCCESS % QUESTION [#permalink]

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New post 13 Oct 2010, 23:30
vanidhar wrote:
How many liters of a 40% iodine solution need to be mixed with 35 liters of a 20% iodine solution to
create a 35% iodine solution?
a. 35
b. 49
c. 100
d. 105
e. 140


Lets say we need x liters.
After mixing we get (x+35) liters.

Total Iodine before = Total Iodine after
\(40%*x + 20%*35 = 35%*(x+35)\)
\(5%*x=35*15%\)
\(x=35*3=105\)

Answer is (d)
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Joined: 08 Sep 2010
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Re: EAMA SUCCESS % QUESTION [#permalink]

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New post 13 Oct 2010, 23:33
Suppose x litres of 40% iodine solution is required.Then total volume of resultant 35 % iodine solution will be (x+35) litres.
Considering the iodine content ...we can derive
(40x/100) + ((20*35)/100) = (x+35) *(35/100)
Solving we get x=105 Litre .Hence D is the answer.

Consider KUDOS if its helpful.
Re: EAMA SUCCESS % QUESTION   [#permalink] 13 Oct 2010, 23:33
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EAMA SUCCESS % QUESTION

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