Chen is baking muffins and banana bread for a brunch buffet. He needs 3 and one-fifth cups of flour to make the muffins and 3 and two-thirds cups of flour to make the banana bread. Which is the best estimate of the number of cups of flour that Chen needs to bake both recipes?
A. 6 cups of flour
B. 7 cups of flour
C. 8 cups of flour
D. 9 cups of flour
To find the best estimate of the number of cups of flour that Chen needs to bake both recipes, we need to add the amount of flour needed for the muffins and the amount of flour needed for the banana bread.
3 and 1/5 cups + 3 and 2/3 cups = 3.2 + 3.67 = 6.87
Since Chen cannot have a fraction of a cup of flour, we need to round up to the nearest whole number.
Rounding 6.87 up to the nearest whole number gives us 7.
Therefore, the best estimate of the number of cups of flour that Chen needs to bake both recipes is 7 cups of flour.
The answer is B. 7 cups of flour.