document.write( "Question 1131129: Bob can plant a garden by her self in 10 hours. When her son Andrew helps her the total time it takes them to plant the garden is 4 hours. How long would it take Andrew to plant the garden himself \n" ); document.write( "

Algebra.Com's Answer #747752 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "Working together, Bob and Andrew make    of the job per hour.\r\n" );
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document.write( "Working alone, Bob makes    of the job per hour.\r\n" );
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document.write( "Hence, working alone, Andrew makes   -  =  =   of the job per hour.\r\n" );
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document.write( "It means that Andrew needs   hours =  hours = 6 hours and 40 minutes to complete the job working alone.    Answer\r\n" );
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\n" ); document.write( "\n" ); document.write( "The lessons to learn from this solution :\r
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document.write( "    1)  You can solve this problem/(such problems) even without using equations.\r\n" );
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document.write( "        Freely manipulating with fractions is enough.\r\n" );
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document.write( "    2)  Use the notion \"rate of work\" and remember:\r\n" );
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document.write( "            a)  when two persons work together, their combined rate of work is the sum of individual rates;\r\n" );
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document.write( "            b)  when the combined rate of two workers is given along with the rate of one of them, the rate \r\n" );
document.write( "                of the other worker is the difference of combined rate and the given individual rate.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Very simple rules, and they allow to solve MANY OF SIMILAR PROBLEMS.\r
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\n" ); document.write( "\n" ); document.write( "It is a standard and typical joint work problem.\r
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\n" ); document.write( "\n" ); document.write( "There is a wide variety of similar solved joint-work problems with detailed explanations in this site. See the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Using Fractions to solve word problems on joint work \r
\n" ); document.write( "\n" ); document.write( "    - Solving more complicated word problems on joint work \r
\n" ); document.write( "\n" ); document.write( "    - Selected joint-work word problems from the archive \r
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\n" ); document.write( "\n" ); document.write( "Read them and get be trained in solving joint-work problems.\r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-I in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this textbook under the topic
\n" ); document.write( "\"Rate of work and joint work problems\" of the section \"Word problems\".\r
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\n" ); document.write( "\n" ); document.write( "Save the link to this online textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-I
\n" ); document.write( "https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "to your archive and use it when it is needed.\r
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