document.write( "Question 720122: how to solve this question ? \r
\n" ); document.write( "\n" ); document.write( "1) a road is 2 km long. what is the length of the road on a map of scale 1:20000 ?\r
\n" ); document.write( "\n" ); document.write( "2) a map uses a scale of 1:5000. what is the actual length of a river if it measures 5cm on the map? give your answer in km. . \n" ); document.write( "

Algebra.Com's Answer #852506 by ikleyn(53325) $\"\"$ $\"About$

You can put this solution on YOUR website!
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\n" ); document.write( "how to solve this question ?
\n" ); document.write( "1) a road is 2 km long. what is the length of the road on a map of scale 1:20000 ?
\n" ); document.write( "2) a map uses a scale of 1:5000. what is the actual length of a river if it measures 5cm on the map?
\n" ); document.write( "give your answer in km.
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document.write( "(1)  A road is 2 kilometers long. 2 kilometers is 2000 meters.\r\n" );
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document.write( "     The scale 1 : 20000  means that 1 centimeter on the map is 20000 centimeters in the field.\r\n" );
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document.write( "     It is the same as to say that 1 centimeter on the map is 200 meters in the field.\r\n" );
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document.write( "     2000 meters is 10 times 200 meters.\r\n" );
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document.write( "     Hence, according to common sense (or the law of proportion), 10 centimeters on the map is 2000 meters in the field.\r\n" );
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document.write( "     Thus the length of the road on the map is 10 centimeters.    <<<---===  ANSWER.\r\n" );
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document.write( "(2)  A map uses a scale of 1:5000.  It means that 1 cm on the map corresponds to 5000 cm in the field,\r\n" );
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document.write( "     i.e. 1 cm on the map corresponds to 50 meters in the field.\r\n" );
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document.write( "     Hence, according to common sense (or the law of proportion), \r\n" );
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document.write( "     5 centimeters on the map corresponds to 5*50 = 250 meters in the field.    <<<---===  ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "That's all.   It sounds as a song or as a poem.   Because the common sense follows to law of harmony.\r
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\n" ); document.write( "\n" ); document.write( "Now compare it with the composition by @Theo in his post.\r
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\n" ); document.write( "\n" ); document.write( "It is a collapse of a brain. Why inches ? Why these unnecessary conversions ? Nobody asked about inches . . . \r
\n" ); document.write( "\n" ); document.write( "Nobody asked about these decimal fractions . . . It is a collapse . . . \r
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\n" ); document.write( "\n" ); document.write( "I advise you to ignore the post by @Theo - escape and run from it - - - as fast and as far as you can.\r
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\n" ); document.write( "\n" ); document.write( "I completed.\r
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\n" ); document.write( "\n" ); document.write( "My reader, I wish you to live in harmony forever, with a well-functioning brain. \r
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\n" ); document.write( "\n" ); document.write( "In such simple problems/assignments, you better lean on your common sense rather than crazy compositions.\r
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\n" ); document.write( "\n" ); document.write( "            When you learn Math (or Science, or everything), \r
\n" ); document.write( "\n" ); document.write( "        it is of critically importance to learn from good sources.\r
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