document.write( "Question 8045: A sum of Rs. 500 is in the form of denominations of Rs. 5 and 10. If total no. of notes is 90, find no. of each type of note.
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Algebra.Com's Answer #4414 by gokhalesujata(4)\"\" \"About 
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Let x be the number of notes of denomination Rs5
\n" ); document.write( "Let y be the number of notes of denomination Rs10
\n" ); document.write( "we know that the total amount is Rs500 which means 5 times the number of notes of denom Rs5 + 10 times the number of notes of denomination Rs 10 equals 500
\n" ); document.write( "ie. 5x+10y=500
\n" ); document.write( "Also total number of notes is 90 ie x+y=90
\n" ); document.write( "hence x=90-y
\n" ); document.write( "5*(90-y)+10y=500
\n" ); document.write( "450-5y+10y=500
\n" ); document.write( "5y=500-450
\n" ); document.write( "5y=50
\n" ); document.write( "y=50/5
\n" ); document.write( "y=10
\n" ); document.write( "x=90-y=90-10=80
\n" ); document.write( "hence 10 notes of Rs10 and 80 notes of Rs5
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