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Constant Ratio On math

Mathematics
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This weekend karen participated in a road race. The ratio of the  number of miles she ran to the number of miles she walked is 4: 5. how many miles did karen run if she walked 10 miles 

Oct 16th, 2014

4 miles run : 5 miles walk : : x miles run : 10 miles walked

4 / 5 = x / 10

Now multiply by 10 on both sides, we get

10 * 4 / 5 = x

40 / 5 = x

8 = x

x = 8

Hence if she walked 10 miles, then she have run 8 miles.

Oct 16th, 2014

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