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Bunuel
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Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
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It could also be done by alligation

Let First solution be S1 having 25% chemical A
Let Second solution which is to be mixed be S2 having 100% chemical A
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File comment: Answer: E
alligation..JPG
alligation..JPG [ 30.86 KiB | Viewed 7436 times ]

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