Question 438564: Finding out an equation from a word problem?
Kate borrows $10000. Some is from her friend at %8 annual interest, twice as much as that from her bank at %9 , and the remained from her insurance company at %5. She pays a total of $830 in interest for the first year.
x + y + z = 10000
.08x + .09y +.05z=830
What is the 3rd equation? Im not sure how to se up the twice as much as from her bank?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Finding out an equation from a word problem?
Kate borrows $10000. Some is from her friend at %8 annual interest, twice as much as that from her bank at %9 , and the remainer is from her insurance company at %5. She pays a total of $830 in interest for the first year.
Quantity Eq::::: x + y + z = 10000
Interest equation: .08x + .09y +.05z = 830
Quantity Equation: y = 2x
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What is the 3rd equation? Im not sure how to se up the twice as much as from her bank?
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Cheers,
Stan H.
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