SOLUTION: Write a proportion and solve. A 12 ounce serving of Mountain Dew contains 55mg of caffeine. How much is in an 18 ounce serving?
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Question 1071261: Write a proportion and solve. A 12 ounce serving of Mountain Dew contains 55mg of caffeine. How much is in an 18 ounce serving? Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! 12 oz/55mg=18 oz/x mg
cross-multiply
12x=990
x=82.5 mg
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Recognize that 18 is half again 12
half again of 55 is 27.5, which added to 55=82.5
