You can 
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my car gets 18 miles/ gallon
if driving 194 miles, how many gallons of gas will i need
18 miles is to 1 gallon as 194 is to ? gallons.
 18 miles     194 miles
—————————— = ——————————— 
 1 gallon     x gallons
       18     194 
      ———— = —————— 
        1      x 
       18x = 194
         x = 
         x = 
 gallons
Edwin