document.write( "Question 472070: Help!!!
\n" ); document.write( "On the last day of class before Christmas break, Professor Morton brought donuts to his class that had been studying probability. \"Before you get donuts, you must solve the following problem. I have a box of donuts that are either plain or chocolate covered. There are 12 chocolate-covered donuts, and the probability of randomly selecting a chocolate-covered donut is 0.6. How many donuts are in the box?\" Find the number of donuts for the class. \n" ); document.write( "

Algebra.Com's Answer #323709 by Edwin McCravy(20060) $\"\"$ $\"About$

You can put this solution on YOUR website!
Help!!!
\n" ); document.write( "On the last day of class before Christmas break, Professor Morton brought donuts to his class that had been studying probability. \"Before you get donuts, you must solve the following problem. I have a box of donuts that are either plain or chocolate covered. There are 12 chocolate-covered donuts, and the probability of randomly selecting a chocolate-covered donut is 0.6. How many donuts are in the box?\" Find the number of donuts for the class.
\n" ); document.write( "

\r\n" );
document.write( "  12 = the number of chocolate donuts (given)\r\n" );
document.write( "   x = the number of plain donuts\r\n" );
document.write( "x+12 = the total number of donuts in the box\r\n" );
document.write( "\r\n" );
document.write( "P(selecting a chocolate donut =  = \r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Multiply both sides by (x+12)\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Multiply both sides by 10\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "So there were 12 chocolate donuts and 8 plain ones,\r\n" );
document.write( "making 20 donuts for the class.\r\n" );
document.write( "\r\n" );
document.write( "Edwin

\n" ); document.write( "

\n" );