document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1164747>Question 1164747</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Robert is thinking that his father is 7 years older than twice his age, his grandfather is 4 years less than twice his father’s age. If Robert’s grandfather is 70 years old, how old is Robert ? </SPAN>\n" );
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document.write( "x = Robert's age<BR>\n" );
document.write( "y = his father's age<BR>\n" );
document.write( "70 = his grandfather's age<br><BR>\n" );
document.write( "(1) His grandfather's age, 70, is 4 less than twice his father's age:<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=70+=+2y-4 ALIGN=MIDDLE  ALT=\"70+=+2y-4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "Solve to find his father's age, y.<br><BR>\n" );
document.write( "(2) Robert's father is 7 years older than twice his age.<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+2x%2B7 ALIGN=MIDDLE  ALT=\"y+=+2x%2B7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "Substitute the value of y found in step (1) and solve to find Robert's age.<br>\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );