A recipe uses white flour and brown flour in the
ratio 2: 1. What fraction of flour is brown?
The total ratio is 2 + 1 = 3.
The fraction of brown flour is 1/3 because 1/3 of the total flour is brown.
Alternatively, we can find the fraction of white flour and then subtract it from 1 to find the fraction of brown flour:
The fraction of white flour is 2/3 because there are 2 parts white flour for every 3 parts total flour.
Therefore, the fraction of brown flour is 1 - 2/3 = 1/3.
To determine the fraction of flour that is brown, we need to calculate the ratio of brown flour to the total amount of flour.
Given that the ratio of white flour to brown flour is 2:1, we can say that for every 2 parts of white flour, we have 1 part of brown flour.
Therefore, the total ratio of flour is 2 + 1 = 3 (2 parts white flour + 1 part brown flour).
To find the fraction of flour that is brown, we divide the part representing brown flour by the total parts of flour:
1 part brown flour / 3 total parts of flour.
Thus, the fraction of flour that is brown is 1/3.