document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1055496>Question 1055496</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A certain array of solar cells can generate 6.0 GJ  in 5.0 months  (under standard conditions). After this array has been operating for 3.0 months  , another array of cells is added which alone can generate 15.0 GJ  in 7.0 months . How many additional months, after the new array has been added, is needed for the total energy generated from both arrays to be 30 GJ  ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #670882 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=670882\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find the rate of both arrays,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=R%5B1%5D%2A5=6 ALIGN=MIDDLE  ALT=\"R%5B1%5D%2A5=6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=R%5B1%5D=6%2F5 ALIGN=MIDDLE  ALT=\"R%5B1%5D=6%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=R%5B2%5D%2A7=15 ALIGN=MIDDLE  ALT=\"R%5B2%5D%2A7=15\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=R%5B2%5D=15%2F7 ALIGN=MIDDLE  ALT=\"R%5B2%5D=15%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So after 3 months, array 1 has generated,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%286%2F5%29%2A3=18%2F5 ALIGN=MIDDLE  ALT=\"%286%2F5%29%2A3=18%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So then both together need to generate X to reach 30.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=18%2F5%2BX=30 ALIGN=MIDDLE  ALT=\"18%2F5%2BX=30\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=X=150%2F5-18%2F5 ALIGN=MIDDLE  ALT=\"X=150%2F5-18%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=X=132%2F5 ALIGN=MIDDLE  ALT=\"X=132%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So then together,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28R%5B1%5D%2BR%5B2%5D%29t=132%2F5 ALIGN=MIDDLE  ALT=\"%28R%5B1%5D%2BR%5B2%5D%29t=132%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%286%2F5%2B15%2F7%29t=132%2F5 ALIGN=MIDDLE  ALT=\"%286%2F5%2B15%2F7%29t=132%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=%28132%2F5%29%2F%286%2F5%2B15%2F7%29 ALIGN=MIDDLE  ALT=\"t=%28132%2F5%29%2F%286%2F5%2B15%2F7%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=%28%28132%2F5%29%287%2F7%29%29%2F%28%286%2F5%29%287%2F7%29%2B%2815%2F7%29%285%2F5%29%29 ALIGN=MIDDLE  ALT=\"t=%28%28132%2F5%29%287%2F7%29%29%2F%28%286%2F5%29%287%2F7%29%2B%2815%2F7%29%285%2F5%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=%28924%2F35%29%2F%2842%2F35%2B75%2F35%29 ALIGN=MIDDLE  ALT=\"t=%28924%2F35%29%2F%2842%2F35%2B75%2F35%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=%28924%2F35%29%2F%28117%2F35%29 ALIGN=MIDDLE  ALT=\"t=%28924%2F35%29%2F%28117%2F35%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=924%2F117 ALIGN=MIDDLE  ALT=\"t=924%2F117\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=308%2F39 ALIGN=MIDDLE  ALT=\"t=308%2F39\"   DISABLED_style= \"max-width:90%; height:auto;\" > or approximately 7.9 months. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );