SAT Math Practice Question
$$0.10 x+0.20 y=0.18(x+y)$$Clayton will mix $x$ milliliters of a $10 \%$ by mass saline solution with $y$ milliliters of a $20 \%$ by mass saline solution in order to create an $18 \%$ by mass saline solution. The equation above represents this situation. If Clayton uses 100 milliliters of the $20 \%$ by mass saline solution, how many milliliters of the $10 \%$ by mass saline solution must he use?
- A.5
- B.25
- C.50
- D.100
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