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Math·Algebra·Linear equations in two variables

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A chemist mixed $x$ liters of a $6\%$ saline solution with $y$ liters of a $9\%$ saline solution to produce a $7\%$ saline solution. Which equation best represents this situation? (Assume the volumes of the solutions are additive.)

A

$0.06x+0.09y=7(x+y)$

B

$0.06x+0.09y=0.07(x+y)$

C

$0.6x+0.9y=7(x+y)$

D

$0.6x+0.9y=0.7(x+y)$