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

You know the proportions (amounts) of calories and cups and grams.

 

Now, what multiplier of ½ is needed to convert one half to 2/3?  Whatever that is, use said multiplier to adjust the amounts for calories and grams.

 

Hint: let the multiplier be x; ½(x) = 2/3.  To solve for x, multiple each side of this equation by TWO.