alleryFrom 40 L of pure acid, 4 L is drawn and replaced by water; the step is done twice in all. Acid left?
A32 L
B31.2 L
C33.6 L
D32.4 L
Answer & Solution
Correct answer: D. 32.4 L
Each step leaves 9/10 of the acid, so 40 x (0.9)^2 = 32.4 L.
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