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stmts: some keys are locks
some locks are drawers
all drawers are tablets
concln: 1 no key is a drawer
2 all keys can never be tablets
3 some drawers are keys
4 all keys can never be tablets is a possibility

quant

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In what ratio shoulds acids of concentrations 10%,15% and 50% be mixed to get a 40% concentration.. Can anyone explain hw to solve this..??

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