Amanda can jog 18 3/4 miles in 5 hours. at this rate, how many miles can she run in 4 hours?

Set up a proportion
18  3/4    =  n
   5              4

Cross multiply across the = sign
5 x n= 5n   and 18 3/4 x 4 = 75
5n = 75     now divide both sides by 5
5       5
n=15  Amanda can jog 15 miles in 4 hours.

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