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Math proportions

A recipe for spaghetti requires four 16-ounce bottles of ketchup to make 2 gallons of sauce. How many bottles of ketchup are needed to make 18 gallons of sauce?
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1 Answer

 
Let x - number of bottles needed to make 18 gallons of sauce
 
bottles = 4 =  x       cross multiply
gallons    2   18
 
              2x = 72   divide by 2
                x = 36 bottles