Question

Elizabeth can make 24 beaded bracelets in 18 minutes. At that rate, approximately how

many beaded bracelets will she be able to make in 21 minutes?
A. 18

B. 21

C. 28

D. 16

Answer 1

Answer: C (28)

Explanation:

Use probabilities:

24/18 = x/21

Cross multiply: 18x=24*21

18x = 504

x=28

Answer 2

Answer: 27.3 or 28

Description:
If we divide the number of bracelets (24) by the number of minutes needed to make that number (18), we get 1.3. This means Elizabeth can make approximately 1.3 bracelets per minute.

Knowing this we need to multiply the average number of bracelets per minute made and the number of minutes we want to calculate for.

1.3 x 21 = 27.3 or 28