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Sajjad1994
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A => 30 % , 50% or 70%
B=> 20% , 40% and 60%

lets say , y% of A is mixed with z% of B to get the 50% in the combined reagent.

She has twice as much of Brand B as Brand A.­

Hence , we get y + 2z= 150

lets try different values of z and y.
If z = 60 , then 30 + 120 = 150 
But there is no value of y as 30. Hence z cant be 60.

Lets take  y=70 and z=40 , 70 + 40*2 = 150 
 It works and is the answer. ( Keep trying only with the 6 values given i.e 30 , 50 , 70 , 20 , 40 and 60 ).

GMATinsight chetan2u KarishmaB Am I right in my approach ?­
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Yep this is correct. Your diagram is similar to the alligation method which might be faster but this is a good approach.
sayan640
A => 30 % , 50% or 70%
B=> 20% , 40% and 60%

lets say , y% of A is mixed with z% of B to get the 50% in the combined reagent.

She has twice as much of Brand B as Brand A.­

Hence , we get y + 2z= 150

lets try different values of z and y.
If z = 60 , then 30 + 120 = 150
But there is no value of y as 30. Hence z cant be 60.

Lets take y=70 and z=40 , 70 + 40*2 = 150
It works and is the answer. ( Keep trying only with the 6 values given i.e 30 , 50 , 70 , 20 , 40 and 60 ).

GMATinsight chetan2u KarishmaB Am I right in my approach ?­
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