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Jan invests $9885 in two accounts.  One earns 6% interest.  The other earns 9.5%.   She made $695.35 in one year from both.  How much did she invest in each?

A chemist wants to make 75 liters of 16% acid solution.  He is going to make it by mixing a 10% acid solution and a 25% acid solution.  How many liters of each will he need?

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