Can you help me write this as a equation?

Question

One serving of oatmeal provide 16% of the dietary fiber do you need daily. You must get the remaining 21 grams of dietary fiber from other sources. How many grams of dietary fiber do you need daily?

Answer 1

Hi, Ashlie. Another way to phrase this problem is:

 

21 is 84% of what number?

 

21/x = 84/100

84x = 2100

x = 25. You should receive 25 g of fiber daily.