Question 462929
A store mixes Brazilian coffee worth $10 per kilogram and Turkish coffee worth $14 per kilogram. The mixture is to sell for $13 per kilogram. 
Find how much of each should be used to make a 528-kilogram mixture.
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Quantity Equation: B + T = 528 kgr
Value Equation::: 10B+14T = 13*528
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Multiply  thru the 1st equation by 10:
10B  +  10T = 10*528
10B  +  14T = 13*528
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Subtract and solve for "T": 
4T = 3*528
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T = 3*132
T = 396 kgr (amt. of Turkish coffee needed)
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Solve for "B":
B + T = 528
B + 396 = 528
B = 132 kgr (amt of Brazilian coffee needed)
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Cheers,
Stan H.
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How many kilograms of the Brazilian coffee should be in the mixture?
How many kilograms of the Turkish coffee should be in the mixture?