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How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way
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How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?
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2 -3 6
1 8 -31
3 -2 -5
matrices...
1 8 -31
3 -2 -5
matrices...
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