Digital SAT Math Practice Question #2442
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Desmos / Fast Proportion: Set up equivalent fractions $\frac{a}{b} = \frac{c}{d}$ and cross-multiply in seconds.
Let $x$ be liters of 20% solution: $0.20x + 0.50(60 - x) = 0.30(60) = 18 \implies 0.20x + 30 - 0.50x = 18 \implies -0.30x = -12 \implies x = 40$ liters....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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