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If 4 litres of laboratory alcohol is 80% pure (80% alcohol, 20% water), how many litres of water must be added so that the resulting mixture will contain 30%?
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Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.
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Agarden consists of an apple tree, a pear tree, cauliflowers, and heads of cabbage. there are 40 vegetables in the garden. 24 of them are cauliflowers. what is the ratio of the number of cauliflowers to the number of heads of cabbage?
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If 4 litres of laboratory alcohol is 80% pure (80% alcohol, 20% water), how many litres of
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