document.write( "Question 778957: jacob is three times as old as his brother.if jacob's age is 12,how old will jacob be when he is twice as old as his brother? \n" ); document.write( "

Algebra.Com's Answer #475937 by Edwin McCravy(20055) $\"\"$ $\"About$

You can put this solution on YOUR website!
jacob is three times as old as his brother.
\n" ); document.write( "

\r\n" );
document.write( "J = 3B\r\n" );
document.write( "

\n" ); document.write( "if jacob's age is 12,
\n" ); document.write( "

\r\n" );
document.write( "12 = 3B\r\n" );
document.write( " 4 = B,  so the brother is 4\r\n" );
document.write( "

\n" ); document.write( "how old will jacob be when he is twice as old as his brother?
\n" ); document.write( "

\r\n" );
document.write( "Let that be x years from now.  So in x years from now,\r\n" );
document.write( "\r\n" );
document.write( "Jacob will be 12+x and his brother will be 4+x\r\n" );
document.write( "\r\n" );
document.write( "12+x = 2(4+x)\r\n" );
document.write( "\r\n" );
document.write( "12+x = 8+2x\r\n" );
document.write( "\r\n" );
document.write( "   4 = x\r\n" );
document.write( "\r\n" );
document.write( "So that will be 4 years from now\r\n" );
document.write( "\r\n" );
document.write( "So Jacob will be 12+4 or 16 and his brother will be 4+4 or 8.\r\n" );
document.write( "\r\n" );
document.write( "Answer:  Jacob will be 16.\r\n" );
document.write( "\r\n" );
document.write( "Edwin

\n" ); document.write( "

\n" );