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23 Mar 2020, 05:02
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E
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Difficulty:
25%
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Question Stats:
81% (02:10) correct
19%
(02:21)
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based on 313
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If an amount of a solution containing 10 percent Chemical A is combined with twice as much of a solution that is 30 percent Chemical A and four times as much of a solution that is 35 percent Chemical A, what is the concentration of Chemical A in the resulting solution?
A. 17.5%
B. 20%
C. 25%
D. 27.5%
E. 30%
A. 17.5%
B. 20%
C. 25%
D. 27.5%
E. 30%
23 Mar 2020, 05:10
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Bunuel
If an amount of a solution containing 10 percent Chemical A is combined with twice as much of a solution that is 30 percent Chemical A and four times as much of a solution that is 35 percent Chemical A, what is the concentration of Chemical A in the resulting solution?
A. 17.5%
B. 20%
C. 25%
D. 27.5%
E. 30%
A. 17.5%
B. 20%
C. 25%
D. 27.5%
E. 30%
Asked: If an amount of a solution containing 10 percent Chemical A is combined with twice as much of a solution that is 30 percent Chemical A and four times as much of a solution that is 35 percent Chemical A, what is the concentration of Chemical A in the resulting solution?
Solution********** Amount of solution*************** Amount of Chemical A
1 ****************** x ********************************** 0.1x
2 ****************** 2x ******************************** 0.6x
3 ****************** 4x ******************************** 1.4x
Amount of chemical A = 2.1x
Amount of solution = 7x
Concentration of chemical A in the resulting solution = 2.1x/7x = 30%
IMO E
23 Mar 2020, 11:50
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Bunuel
If an amount of a solution containing 10 percent Chemical A is combined with twice as much of a solution that is 30 percent Chemical A and four times as much of a solution that is 35 percent Chemical A, what is the concentration of Chemical A in the resulting solution?
A. 17.5%
B. 20%
C. 25%
D. 27.5%
E. 30%
A. 17.5%
B. 20%
C. 25%
D. 27.5%
E. 30%
let initial chemical A = 100
so part of A = 10
then 2nd solution = 200
part of A = 60
and 3rd solution =400
part of A = 140
total solution =700 and chemical A= 210
so % ; 210/700 ; 30%
IMO E
