document.write( "Question 1188672: Angela created a mosaic design using square 4-by-4 cm white tiles and rectangular 4-by-5 cm black tiles. She used twice as many white tiles as black tiles. The finished pattern was 2704 sq cm in area. How many rectangular tiles did she use? \n" ); document.write( "

Algebra.Com's Answer #819809 by ikleyn(52802) $\"\"$ $\"About$

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

\r\n" );
document.write( "\r\n" );
document.write( "x black tiles and 2x white tiles.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Write the total area equation\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    20x + 16*(2x) = 2704  cm^2\r\n" );
document.write( "\r\n" );
document.write( "    20x + 32x     = 2704\r\n" );
document.write( "\r\n" );
document.write( "       52x        = 2704\r\n" );
document.write( "\r\n" );
document.write( "         x        = 2704/52 = 52.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "ANSWER.  52 black rectangular tiles.\r\n" );
document.write( "

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

\n" );