document.write( "Question 39080: Hello!\r
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document.write( "Can someone help please?\r
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document.write( "My question is:\r
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document.write( "If you take $20 from the first and put it into the second of three purses, the second would then contain 4 times as much as remains in the first. If $60 of what is now in the second is put into the third, the third will contain twice what is in the first and second together. Now, if $40 be removed from the third and put into the first, there will be half as much as in the third. What did each purse originally hold?\r
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document.write( "I know the answer is $50, $100 and $120 but I don't know how to work it out.\r
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document.write( "Thanks
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document.write( "Marcee \n" );
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Algebra.Com's Answer #24801 by Paul(988)![]() ![]() ![]() You can put this solution on YOUR website! Let the second one be x \n" ); document.write( "Let the first one be y \n" ); document.write( "Let the third one be z \n" ); document.write( "FIRST EQUATION: \n" ); document.write( "x+20=4(y-20) \n" ); document.write( "x=4y-80-20 \n" ); document.write( "x=4y-100 (SUBSITUTION 1)\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "SECOND EQUATION: \n" ); document.write( "z+60=2(y-20+x+20-60) \n" ); document.write( "z+60=2y-40+2x+40-60 \n" ); document.write( "z=2y+2x-120 (SUBSITUTION 2)\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "THIRD EQUATION: \n" ); document.write( "z-40=2y+80\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "ALLOW THE SUBSITUTION: \n" ); document.write( "Subsitute for z: \n" ); document.write( "2y+2x-120=2y+80 \n" ); document.write( "2x=200 \n" ); document.write( "x=100\r \n" ); document.write( "\n" ); document.write( "FROM 1st EQUATION: \n" ); document.write( "x=4y-100 \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "y=50\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "z=2(50)+2(100)-120 \n" ); document.write( "z=180 ( I have no idea how to get 120) \n" ); document.write( "Hence, the money in three purses were $50, $100, and $180. \n" ); document.write( "Paul.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |