Mrs.Wally Amos uses 3/4 of a bag of flour to make a dozen cookies. How many bags of flour will she need to make 21/4 dozen cookies

To determine how many bags of flour Mrs. Wally Amos needs for \( \frac{21}{4} \) dozen cookies, we can follow these steps:

1. **Calculate the amount of flour needed for one dozen cookies**:  
   She uses \( \frac{3}{4} \) of a bag of flour for 1 dozen cookies.

2. **Calculate the amount of flour needed for \( \frac{21}{4} \) dozen cookies**:  
   Multiply the amount of flour for 1 dozen by \( \frac{21}{4} \):
   \[
   \text{Flour for } \frac{21}{4} \text{ dozen} = \frac{3}{4} \times \frac{21}{4}
   \]

   \[
   = \frac{3 \times 21}{4 \times 4} = \frac{63}{16}
   \]

3. **Convert \( \frac{63}{16} \) to bags**:  
   Since \( 1 \) bag of flour equals \( 16/16 \), we find out how many bags are needed:
   \[
   \text{Bags needed} = \frac{63}{16} \text{ bags} \approx 3.9375 \text{ bags}
   \]

This means Mrs. Wally Amos will need approximately 4 bags of flour to make \( \frac{21}{4} \) dozen cookies.

### Summary
Mrs. Wally Amos needs approximately 4 bags of flour.

Would you like more details or do you have any questions? Here are some related questions you might consider:

1. How much flour would she need for 5 dozen cookies?
2. If she had only 2 bags of flour, how many cookies could she make?
3. What other ingredients does she need for the cookies?
4. How long does it take to bake a dozen cookies?
5. How many cookies can she make with one bag of flour?

**Tip:** Always double-check your fractions when multiplying to ensure accuracy!

Mrs.Wally Amos uses 3/4 of a bag of flour to make a dozen cookies. How many bags of flour will she need to make 21/4 dozen cookies?

Discover how to calculate the number of bags of flour needed to make 21/4 dozen cookies, using the ratio of flour per dozen. This problem demonstrates the application of fractions and proportions in baking calculations, suitable for students in Grades 5-7.

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