document.write( "Question 1199590: Hi
\n" ); document.write( "Box A contains $1 coins box B contains 50 cent coins and box C contains 20cent coins. A has 5 times as many coins as C. B has 12 fewer than A. C has half the number in B. How much money is in box A. \r
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Algebra.Com's Answer #833523 by math_tutor2020(3816)\"\" \"About 
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\n" ); document.write( "A = number of coins in box A
\n" ); document.write( "B = number of coins in box B
\n" ); document.write( "C = number of coins in box C\r
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\n" ); document.write( "\n" ); document.write( "Stated facts:
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  1. A has 5 times as many coins as C.
  2. B has 12 fewer than A.
  3. C has half the number in B
Let's translate each of those three statements into symbolic form.
  • A = 5C from fact 1
  • B = A-12 from fact 2
  • C = 0.5B from fact 3
Then apply a combination of fact 1 and fact 3.
\n" ); document.write( "A = 5C
\n" ); document.write( "A = 5*0.5B
\n" ); document.write( "A = 2.5B\r
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\n" ); document.write( "\n" ); document.write( "Now involve fact 2 so we can solve for B.
\n" ); document.write( "B = A-12
\n" ); document.write( "B = 2.5B-12
\n" ); document.write( "B-2.5B = -12
\n" ); document.write( "-1.5B = -12
\n" ); document.write( "B = -12/(-1.5)
\n" ); document.write( "B = 8
\n" ); document.write( "There are 8 coins worth 50 cents each in box B.\r
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\n" ); document.write( "\n" ); document.write( "Then,
\n" ); document.write( "A = 2.5B
\n" ); document.write( "A = 2.5*8
\n" ); document.write( "A = 20
\n" ); document.write( "There are 20 coins worth $1 each from box A.
\n" ); document.write( "Ultimately we have 20*1 = 20 dollars in box A.\r
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\n" ); document.write( "\n" ); document.write( "Answer: $20
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