Question

It took Elsa 18 minutes to make 3 bookmarks.

Which of the following pairs of equivalent fractions could be used to determine how many bookmarks she can make in 90 minutes?

Answer 1

Hope this answer helps:

Elsa took time to make 3 bookmarks=18 minutes

Time Elsa took for one minute= 18/3
=6

Total bookmarks mad by Elsa in 90 minutes=90/6
=15 bookmarks

Answer 2

The pair of equivalent fractions would be option A.) “3/18 = b/90.”

The fraction 3/18 shows 3 bookmarks were made in 18 minutes. With this proportion, we can set up an equivalent fraction to find the number of bookmarks made in 90 minutes:

3/18 = b/90,

where 90 represents the time it took in minutes and b represents how many bookmarks were made.

We can divide 18 and 3 by 3 separately to identify the unit rate:

18 / 3 = 6

3 / 3 = 1

When solving, we get 1/6 as our unit rate. Because the relationship is proportional, we know that 1/6 must equal b/90.

1/6 = b/90

1 • 90 = 90

6 • ? = 90

90 / 6 = 15

b = 15

Answer Recap: Option A is correct. If needed, b = 15.