document.write( "Question 451778: jack's dad is 40 years old. Jack is fourteen years old. How old will each of them be when his dad is twice as old as jack? \n" ); document.write( "
Algebra.Com's Answer #310641 by pedjajov(51)\"\" \"About 
You can put this solution on YOUR website!
After x years Jack's age is going to be 14+x and his dad's 40+x.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Dad's age should be twice of Jack's so\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"40%2Bx=2%2814%2Bx%29\" , multiply
\n" ); document.write( "\"40%2Bx=28%2B2x\" , subtract 28 on the both sides
\n" ); document.write( "\"12%2Bx=2x\" , subtract x on both sides
\n" ); document.write( "\"12=x\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Check:
\n" ); document.write( "After 12 years Jack will be 14+12 = 26\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Dad is going to be 40+12 = 52 which is twice 26.
\n" ); document.write( "
\n" );