the nutrition information on the cereal box says that a 1/3 - cup serving...

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QuinScott

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...provides 80 calories and 4 grams of? dietary fiber . At that rate , find how many calories and grams of fiber are in a 1/2 cup serving.
 
120 Calories and 6 grams of dietary fiber (multiply by 3 and divide by 2)
 
Divide the calories for 1/3 cup by 3, then multiply by 2. Same for the fibre content. Sorry but this is basic maths!. 80 calories divided by 3 gives you roughly 27 calories and 1.3 grams of fibre, so a half cup will give you double these anounts, i.e. 54 calories and 2.6 grams of fiber.
 
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