document.write( "Question 1208344: Hi
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document.write( "Alan Ben and Caleb shared some marbles. Alan took 40% of the marbles and was given 1 more . Ben took 25% of the remaining and was given 3 more. Caleb took the remaining 12 marbles. How many were there at first. \n" );
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Algebra.Com's Answer #846707 by ikleyn(52781)![]() ![]() You can put this solution on YOUR website! . \n" ); document.write( "Alan Ben and Caleb shared some marbles. Alan took 40% of the marbles and was given 1 more . \n" ); document.write( "Ben took 25% of the remaining and was given 3 more. \n" ); document.write( "Caleb took the remaining 12 marbles. How many were there at first. \n" ); document.write( "~~~~~~~~~~~~~~~~~\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \r\n" ); document.write( "Let T be the total number of marbles.\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "Alan has 0.4T +1 marbles; the remaining is T - (0.4T+1) = 0.6T-1.\r\n" ); document.write( "\r\n" ); document.write( "Ben has 0.25(0.6T-1) + 3 marbles;\r\n" ); document.write( "\r\n" ); document.write( "Caleb has 12 marbles.\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "Write an equation for the total\r\n" ); document.write( "\r\n" ); document.write( " (0.4T + 1) + (0.25(0.6T-1) + 3) + 12 = T.\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "Simplify and find T\r\n" ); document.write( "\r\n" ); document.write( " 0.4T + 1 + 0.15T - 0.25 + 3 + 12 = T\r\n" ); document.write( "\r\n" ); document.write( " 0.55T + 15.75 = T\r\n" ); document.write( "\r\n" ); document.write( " 15.75 = T - 0.55T\r\n" ); document.write( "\r\n" ); document.write( " 15.75 = 0.45T\r\n" ); document.write( "\r\n" ); document.write( " T = 15.75/0.45 = 35.\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "ANSWER. The total number of marbles is/was 35.\r\n" ); document.write( "\r\n" ); document.write( " This total number of marbles was not changed before and after: it remained THE SAME.\r\n" ); document.write( "\r \n" ); document.write( "\n" ); document.write( "Solved.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "The question in the problem is posed INCORRECTLY.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "The correct question is: \"How many marbles were there in total ?\"\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Let me explain you, WHY I think that the question is posed incorrectly \n" ); document.write( "and WHY a TRUE question should be posed differently.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "In this problem, the marbles were distributed inside some group of three people. \n" ); document.write( "No marbles went outside. Therefore, the total number of marbles at the beginning was \n" ); document.write( "the same as at the end. So, there is a hidden symmetry between the future and the past \n" ); document.write( "in this problem. The symmetry is that the number of the marbles at the origin \n" ); document.write( "and at the end is the same.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "If the problem's creator formulates the problem according to my instruction, he (or she) \n" ); document.write( "demonstrates that he/she recognizes this symmetry and does not violate it. \n" ); document.write( "If he/she formulates differently, he/she demonstrates that he/she does not care \n" ); document.write( "about his/her language and leaves to the reader to figure out these details on his/her own. \n" ); document.write( "My point is that the problem should sound harmonically, should be posed clearly \n" ); document.write( "and should not distract the reader from the essence of the task.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "That's all. \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Behind all this is respect / (or disrespect) for the symmetry, for the harmony and for the reader.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Nothing more and nothing else.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |