We have 2 liters of 20% solution available. How much 70% solution do

Question

We have 2 liters of 20% solution available. How much 70% solution do we need to add to it to get a 30% solution?

A) 0.5
B) 1.00
C) 1.50
D) 2.50
E) 3.00

Kinshook · Answer

Given: We have 2 liters of 20% solution available. 
Asked: How much 70% solution do we need to add to it to get a 30% solution?

Let us assume that x litres of 70% solution will be needed.
70%*x + 20%*2 = (x+2)*30%
40%x = 20%
x = .5

IMO A

AdarshSambare · Answer

Consider the liter of 70% solution be x
Using Allegation:

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