alleryTo 40 L of a 25% solution, how much pure solute must be added to make it 50%?
A10 L
B15 L
C20 L
D25 L
Answer & Solution
Correct answer: C. 20 L
Solute is 10 L and 10 + x = 0.5(40 + x) gives x = 20 L.
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