How do I answer this word math problem

Question

The nutrition information on the cereal box says that a
1/2 cup serving provides 150 calories and 3 grams of dietary fiber. At that rate, find how many calories and grams of fiber are in a 2/3cup serving.

Answer 1

Hi Michelle,

 

We are told that 1/2 cup serving contains 150 calories and 3 grams of fiber.

 

Let's multiply everything by 2. So,

 

1 cup serving has 2*150 = 300 calories and 2*3 = 6 grams of fiber.

 

But, we want to really know about 2/3 cup. So, now we multiply everything by 2/3.

 

2/3 cup has (2/3)(300) = 200 calories and (2/3)(6 grams) = 4 grams of fiber.