IBM
Company
Numerical Ability
Ratio and Proportion
Two solutions of 90% and 97% purity are mixed resulting in 21 litres of mixture of 94% purity. How much is the quantity of the first solution in the resulting mixture?
Read Solution (Total 6)
-
- allegations and mixtures
90 97
94
ratio=(97-94):(94-90)
3:4
quantity of 1st=(21*3)/7=9 litrs - 10 years agoHelpfull: Yes(50) No(1)
- let it be x liters
90x+(21-x)*97=21*94
97x-90x=21(97-94)
7x=21*3
x=9liter - 11 years agoHelpfull: Yes(47) No(8)
- is ans 9?
- 11 years agoHelpfull: Yes(15) No(4)
- 90x+(21-x)97=94*21
ans 9 liter - 7 years agoHelpfull: Yes(3) No(1)
- s1/s2=(97-94)/(94-90)
s1/s2=3/4
s1+s2=21
s1=9 ans
- 7 years agoHelpfull: Yes(2) No(1)
- a x .9 + b x .97 = 21 x .94
b = 21-a
a x .9 + (21-a) x .97 = 21 x .94
a x .9 - a x .97 = 21 x .94 - 21 x .97
-a x .07 = 21 x (-0.03)
7a = 21 x 3
a = 3 x 3
a = 9 - 7 years agoHelpfull: Yes(0) No(1)
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