document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1114109>Question 1114109</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Ben and Greg go to the movies and purchase snacks. Ben purchases four cookies and two bottles of water for a total cost of $9.00. Greg purchases two cookies and two bottles of water for a total cost of $7.00. What is the cost of a bottle of water? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #729136 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52914)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=729136\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "Ben and Greg go to the movies and purchase snacks. Ben purchases four cookies and two bottles of water for a total cost of $9.00. <BR>\n" );
document.write( "Greg purchases two cookies and two bottles of water for a total cost of $7.00. What is the cost of a bottle of water?\r<BR>\n" );
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document.write( "    Good style in solving such problems is to notice/(to observe) immediately from the condition that the difference \r\n" );
document.write( "    between two combinations is  the cost of 2 cookies,  and it is equal to  $9 - $7 = $2.   So  2 cookies cost  $2.\r\n" );
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document.write( "    Then subtracting $2 dollars for 2 cookies from the Greg purchase, you got the cost of two bottles - it is equal to  $7 - $2 = $5. \r\n" );
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document.write( "    <U>Answer</U>.  A bottle of water costs  $2.50.\r\n" );
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document.write( "This problem is for mental solution,  and it would be ideally if you see the solution immediately/instantly as you completed reading its condition. \r<BR>\n" );
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document.write( "There is no any need to write and to solve a system of equations.\r<BR>\n" );
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document.write( "See the lesson\r<BR>\n" );
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document.write( "&nbsp;&nbsp;&nbsp;&nbsp;- <A  rel=nofollow HREF=https://www.algebra.com/algebra/homework/coordinate/lessons/Solving-mentally-word-problems-on-two-equations-in-two-unknowns-NEW.lesson>Solving mentally word problems on two equations in two unknowns</A> \r<BR>\n" );
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document.write( "in this site.\r<BR>\n" );
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document.write( "Such problems are good for using in interviews, &nbsp;if the employer want to check whether the interviewed  had special training in Math.\r<BR>\n" );
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document.write( "If your solution follows my scheme, &nbsp;the interviewer marks &nbsp;\"YES\"&nbsp; in his check-list.\r<BR>\n" );
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document.write( "If you follow the @josgarithmetic way, &nbsp;the interviewer marks \"NO\" in the check-list.\r<BR>\n" );
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document.write( "In the second case, &nbsp;the interviewed person even doesn't know and doesn't understand for what reason the question/(the problem) was given to him.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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