document.write( "Question 157279: On Dave's birthday, his brother Harry is 17 years younger than 3 times his age. The boys'father, Tom, is 12 years older than Henry's age. If Dave is 7 years younger than his brother, how many candles are Dave's cake? \n" ); document.write( "
Algebra.Com's Answer #116004 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
On Dave's birthday, his brother Harry is 17 years younger than 3 times his age. The boys' father, Tom, is 12 years older than Henry's age. If Dave is 7 years younger than his brother, how many candles are Dave's cake?
\n" ); document.write( ":
\n" ); document.write( "Write an equation for each statement
\n" ); document.write( ":
\n" ); document.write( "\"On Dave's birthday, his brother Harry is 17 years younger than 3 times his age.\"
\n" ); document.write( "D = 3D - 17 = H
\n" ); document.write( "or
\n" ); document.write( "H = 3D - 17
\n" ); document.write( ":
\n" ); document.write( "\"Tom, is 12 years older than Henry's age.\" (Tom & Henry! Where did these guys come from??)
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "\"If Dave is 7 years younger than his brother,\"
\n" ); document.write( "D = H - 7
\n" ); document.write( "Or
\n" ); document.write( "H = D+7
\n" ); document.write( ":
\n" ); document.write( "Substitute (D+7) for H in the equation: H = 3D-17
\n" ); document.write( "D + 7 = 3D - 17
\n" ); document.write( "7 + 17 = 3D - D
\n" ); document.write( "24 = 2D
\n" ); document.write( "D = \"24%2F2\"
\n" ); document.write( "D = 12 candles on his cake
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check solution: H = 12 + 7 = 19 yrs
\n" ); document.write( ":
\n" ); document.write( "H = 3D - 17
\n" ); document.write( "19 = 3(12) - 17\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );