If Adrian mixes 15 liters of saline solution A with 5 liters of a 40% saline solution to get a 25% saline solution, what

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C

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Source: Princeton Review

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

The OA is D