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30L acid 21L water 9L
for ratio 3:7
acid 21L and water 21/3 x 7 = 49L
have to add 49-9= 40L
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Answered
30L acid 21L water 9L
for ratio 3:7
acid 21L and water 21/3 x 7 = 49L
have to add 49-9= 40L