alleryHow many litres of 90% acid should be added to 30 L of 60% acid to get a 70% mixture?
A15 L
B20 L
C10 L
D45 L
Answer & Solution
Correct answer: A. 15 L
90% : 60% = (70 - 60):(90 - 70) = 1:2, so for 30 L of 60% acid we need 15 L.
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