document.write( "Question 281604: Please help with a word problem. Translate the problem into a pair of linear equations in two variables. Solve the equations using either elimination or substitution, state your answer for the specified variable.
\n" ); document.write( "A sum of money amounting to $3.80 consists of dimes and quarters. If there are 20 coins in all, how many are quarters?
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Algebra.Com's Answer #204580 by richwmiller(17219)\"\" \"About 
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d+q=20 (1)
\n" ); document.write( "25q+10d=380 (2)
\n" ); document.write( "multiply the first by 10
\n" ); document.write( "10q+10d=200
\n" ); document.write( "subtract from second.
\n" ); document.write( "15q=180
\n" ); document.write( "q=180/15
\n" ); document.write( "q=12
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