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What is the sum of the solution of the equation 3x^2 + 11x = 4 (three x squared plus 11x equals four) ?
A father and his two sons bought a drug store for $320,000. If the father invested twice as much as the older son, and the older son invested $45,000 less than twice the younger son, how much did the father and his sons each invest?
By weight, one alloy is 75% copper and 25% zinc. Another alloy is 42% copper and 58% zinc. How many grams of each or these are required to make 200 grams of an alloy that is 60% copper and 40% zinc?
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