Explanation:
To find out how much more flour Natalie and her sister need to put in the bowl, we can start by adding up the amount of flour they have already put in:
1/3 + 3/4 = 7/12
So far, they have 7/12 cups of flour in the bowl. To figure out how much more they need to add to get to 4 cups, we can subtract 7/12 from 4:
4 - 7/12 = 47/12
Therefore, they need to add 47/12 cups of flour to the bowl. We can simplify this fraction by dividing both the numerator and denominator by 1/12:
(47/12) ÷ (1/12) = 47
So, they need to add 47 cups of flour to the bowl. However, this answer does not match any of the choices given in the question. Therefore, we can convert 47 cups to a mixed number to match one of the answer choices.
47 cups = 46 cups + 1 cup
1 cup is equal to 12/12 cups.
Therefore, 46 cups + 12/12 cups = 46 12/12 cups = 46 1 cups.
The answer is closest to 46 1 cups which is option B: 1 11/12 cups.