document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=963834>Question 963834</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Mr. Santana is 3 times his daughter Kara's age. Ten years ago, Mr. Santana was 7 times Kara's age.<BR>\n" );
document.write( "Which system of equations could you solve to find Mr. Santana's current age? f = father's age and d = daughter's age<BR>\n" );
document.write( " A) 3f = d ; f - 10 = 7d - 10<BR>\n" );
document.write( " B) f = 3d ; f + 10 = 7(d + 10)<BR>\n" );
document.write( " C) f = d/3 ; f + 10 = 7d - 10<BR>\n" );
document.write( " D) f = 3d ; f - 10 = 7(d - 10) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #588816 by </B><A HREF=/tutors/aboutme.mpl?userid=addingup><B>addingup(3677)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=addingup><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=addingup><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=588816\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> D is the correct answer.Explain. The problem says:<BR>\n" );
document.write( "Father is 3 x daughter, f=3d (D) <BR>\n" );
document.write( "------------------------<BR>\n" );
document.write( "Next:<BR>\n" );
document.write( "10 years ago f= 7d <BR>\n" );
document.write( "This was 10 years ago. We deduct 10 from both sides because 10 years ago both f and d were 10 years younger:<BR>\n" );
document.write( "f-10= 7(d-10) This is also D) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );