document.write( "Question 1114107: 
Find the missing number\r\n" );
document.write( "27   74   215\r\n" );
document.write( "12   x     80\r\n" );
document.write( "39  110   323
\n" ); document.write( "
Algebra.Com's Answer #754806 by ikleyn(52814)\"\" \"About 
You can put this solution on YOUR website!
.
\n" ); document.write( "
\r\n" );
document.write( "From one side, without any given context, this problem is a kind of RUBBISH.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "From the other side, we see a matrix here, and the natural wish is to check if its determinant is zero.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "By checking for the zero determinant, we obtain  x = 29.    ANSWER\r\n" );
document.write( "
\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );