document.write( "Question 426823: A total of $12,000 is invested in 3 accounts earning 5%, 6%, and 7% annual interest. The combined interest for one year is $771. If the amount invested at 7% is three times the amount at 6%, find the amount invested at 5%. \r
\n" ); document.write( "\n" ); document.write( "Enter the amount rounded to the nearest dollar, without commas or the dollar symbol. \n" ); document.write( "
Algebra.Com's Answer #296849 by lwsshak3(11628)\"\" \"About 
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A total of $12,000 is invested in 3 accounts earning 5%, 6%, and 7% annual interest. The combined interest for one year is $771. If the amount invested at 7% is three times the amount at 6%, find the amount invested at 5%.
\n" ); document.write( "Enter the amount rounded to the nearest dollar, without commas or the dollar symbol.\r
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\n" ); document.write( "\n" ); document.write( "let x=dollar amount invested at 6%
\n" ); document.write( " 3x=dollar amount invested at 7%
\n" ); document.write( " 12000-3x-x=12000-4x=dollar amount invested at 5%
\n" ); document.write( " combined interest given=771
\n" ); document.write( "..
\n" ); document.write( ".06x+.07*3x+.05*(12000-4x)=771
\n" ); document.write( ".06x+.21x+600-.20x=771
\n" ); document.write( ".07x=171
\n" ); document.write( "x=171/.07=2442.85 (dollar amount invested at 6%)
\n" ); document.write( "12000-4x=2228.57 (dollar amount invested at 5%)
\n" ); document.write( "ans:
\n" ); document.write( "2228.57 is the dollar amount invested at 5% \r
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