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Hi
A car travels 700 miles in 5 days.  
At this rate, how far will it travel in 24 days?
Let x represent how far it will travel in 24 days
Sets Up the Proportion:
   | Cross Multiplying
     | Cross Multiplying 
      5x = 24*700
       x = 24*700/5
       x = 3360 mi, how far it will travel in 24 days
CHECKING our Answer*** 
700/5 = 140 = 3360/24