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If Adrian mixes 15 liters of saline solution A with 5 liters

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by swerve » Wed Jun 05, 2019 2:47 pm
let \(x=saline\) % of \(A\)
\(15\cdot x+5\cdot 0.4=20\cdot 0.25\)
\(x=\frac{1}{5}=20\)%
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by Scott@TargetTestPrep » Thu Jun 06, 2019 4:58 pm
BTGmoderatorDC wrote:If Adrian mixes 15 liters of saline solution A with 5 liters of a 40% saline solution to get a 25% saline solution, what percent saline is solution A ?

a. 5
b. 10
c. 15
d. 20
e. 25

OA D

Source: Princeton Review
Let solution A be an x% saline solution; we can create the equation:

15(x/100) + 5(0.4) = 0.25(15 + 5)

15x/100 + 2 = 5

15x/100 = 3

15x = 300

x = 20

Answer: D

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