document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1210373>Question 1210373</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Emilía has an average of 70 on 4 different tests. If the lowest score is dropped, her average rises to 90. What is the lowest score? </SPAN>\n" );
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document.write( "x = sum of the three scores after the lowest score was dropped, i.e. we ignore the lowest score<BR>\n" );
document.write( "x/3 = 90 = mean of those three scores<BR>\n" );
document.write( "x = 3*90 = 270\r<BR>\n" );
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document.write( "y = lowest score that was dropped<BR>\n" );
document.write( "x+y = sum of four test scores<BR>\n" );
document.write( "(x+y)/4 = 70<BR>\n" );
document.write( "(270+y)/4 = 70<BR>\n" );
document.write( "270+y = 4*70<BR>\n" );
document.write( "270+y = 280<BR>\n" );
document.write( "y = 280-270<BR>\n" );
document.write( "y = 10\r<BR>\n" );
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document.write( "Answer: 10<BR>\n" );
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