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# How many liters of Chemical A must be added to a 120-liter solution th

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Math Expert
Joined: 02 Sep 2009
Posts: 58340
How many liters of Chemical A must be added to a 120-liter solution th  [#permalink]

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26 Sep 2018, 04:57
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Difficulty:

15% (low)

Question Stats:

83% (01:53) correct 17% (02:24) wrong based on 93 sessions

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How many liters of Chemical A must be added to a 120-liter solution that is 25 percent Chemical A in order to produce a solution that is 40 percent Chemical A?

(A) 12
(B) 15
(C) 20
(D) 24
(E) 30

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Intern
Joined: 25 Sep 2018
Posts: 3
Re: How many liters of Chemical A must be added to a 120-liter solution th  [#permalink]

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26 Sep 2018, 23:09
1
.25*120+x=.40(120+x)
100[.25*120+x=.40(120+x)]100
25*120+100x=40(120+x)
3000+100x=4800+40x
100x-40x=4800-3000
60x=1800
x=30

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Re: How many liters of Chemical A must be added to a 120-liter solution th   [#permalink] 26 Sep 2018, 23:09
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# How many liters of Chemical A must be added to a 120-liter solution th

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