On a map, the distance between village A and village B measures 6 centimeters and the distance between village A and village C measures 9 centimeters. The actual distance from village A to village B is 20 kilometers. If the distance between two points on a map is directly proportional to the actual distance between the locations, how far is it from village A and village C in kilometers?

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Answers

2014-10-06T19:45:49+08:00
Using the idea of ratio and proportion you'll have the distance from A to C as 
 \frac{AC}{9cm} =  \frac{20km}{6cm}
AC =  \frac{(20km)(9cm)}{6cm}
cm will cancel out
AC = 30km

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