document.write( "Question 1099148: Chris spent $45 buying 12 books to donate to the local elementary school. Activity books cost $2 each and story books cost $9 each, how many of each type of book did Chris purchase? \n" ); document.write( "

Algebra.Com's Answer #713551 by ikleyn(52803) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "

\r\n" );
document.write( "Let A be the number of activity books.\r\n" );
document.write( "\r\n" );
document.write( "Then the number of story books is (12-A).\r\n" );
document.write( "\r\n" );
document.write( "The \"money\" equation is\r\n" );
document.write( "\r\n" );
document.write( "2A + 9*(12-A) = 45    dollars.   (Counting A-books at 2 dollars and story-books at 9 dollars)\r\n" );
document.write( "\r\n" );
document.write( "Simplify and solve for A:\r\n" );
document.write( "\r\n" );
document.write( "2A + 108 - 9A = 45  ====>  -7A = 45 - 108 = - 63   ====>  A =  = 9.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Answer.  Chris purchased 9 activity books and 12-9 = 3 story books.\r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );