document.write( "Question 159537: 1. A person bought some pens and pencils for Rs. 564. If each pen cost Rs.7 and each pencil Rs.3 and the total number of pens and pencils he bought was RS. 108.find the number of each item. \n" ); document.write( "

Algebra.Com's Answer #117661 by atique.ah(27) $\"\"$ $\"About$

You can put this solution on YOUR website!
1. A person bought some pens and pencils for Rs. 564. If each pen cost Rs.7 and each pencil Rs.3 and the total number of pens and pencils he bought was RS. 108.find the number of each item.
\n" ); document.write( "You may edit the question. Maybe convert formulae to the same formula notation \r
\n" ); document.write( "\n" ); document.write( "Let # pens = x
\n" ); document.write( " #pencils = y
\n" ); document.write( "7x + 3y = 564 equation(1)
\n" ); document.write( "x + y = 108 equation(2)\r
\n" ); document.write( "\n" ); document.write( "frome1(2)
\n" ); document.write( "x = 108 - y substituting this in equation(1)
\n" ); document.write( "7(108 -Y) + 3Y = 564
\n" ); document.write( "756 - 7Y + 3Y = 564
\n" ); document.write( "756 - 4Y = 564
\n" ); document.write( "-4Y = 564 -756
\n" ); document.write( "- 4Y = - 192
\n" ); document.write( "Y = 192/4
\n" ); document.write( "Y = 48\r
\n" ); document.write( "\n" ); document.write( "ANSWER: NUMBER OF PENCILS= 48
\n" ); document.write( " NUMBERS OF PEN= 60 \n" ); document.write( "

\n" );