Question

To make 5 dinner rolls, 1/3 cup of flour is used. How much flour is needed to make 1 dinner roll? How many cups of flour are needed to make 3 dozen dinner rolls? How many rolls can you make with 5 2/3 cups of flour?

Answer 1

To make 5 dinner rolls, 1/3 cup of flour is used.

1. In order to know how much flour is needed to make 1 dinner roll, you should divide the amount of flour needed to make 5 rolls by the number of rolls:

`(1)/(3):5=(1)/(3)\cdot (1)/(5) =(1)/(15).`

Answer 1: to make one dinner roll it is needed 1/15 cups of flour.

2. In order to know how much flour is needed to make 3 dozen (3·12=36) dinner rolls, you should multiply the amount of flour needed to make 1 roll by the number of rolls:

`(1)/(15)\cdot 36=(36)/(15)=(12)/(5).`

Answer 2: to make 3 dozen dinner rolls it is needed 12/5 cups of flour.

3. In order to know how many rolls can you make with 5 2/3 cups of flour, you should divide the given amount of flour by the amount of flour needed to make 1 roll:

`5(2)/(3): (1)/(3)=(17)/(3):(1)/(3)=(17)/(3)\cdot (3)/(1)=17.`

Answer 3: you can make 17 dinner rolls with 5 2/3 cups of flour.