Question

A recipe for 5 batches of bagels uses 15 cups of flour. Cris wants to know how many cups are needed for 1 batch. Johanna wants to know how many cups she will need to make 20 batches.

Answer 1

Answer: 3 cups for 1 batch and 60 cups for 20 batches.

Step-by-step explanation: We know that to make 5 batches of bagels, you need 15 cups of flour. We can find out how many cups of flour are needed in a single batch by setting up the following ratios and dividing on both sides:

5 : 15

1 : ?

Divide 5 by 1 and you get 5. We have to divide by five on the other side which is 15 / 5. 15 / 5 is 3, so you need 3 cups of flour for 1 batch.

Now, we need to find how much flour is needed for 20 batches. We can set up the following ratios below but this time, we need to divide 20 by 5:

5 : 15

20 : ?

20 divided by 5 is 4. What divided by 4 gets you to 15? 60 of course, so that means that to make 20 batches, you need 60 cups of flour.

Let me know if this is right! :)