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Answer:

  1. Number of bracelet Jessica can make in 30 minutes=2
  2. Number of bracelet Jessica can make in 60 minutes=4
  3. Number of bracelet Jessica can make in 90 minutes=6
  4. Number of bracelet Jessica can make in 120 minutes=8
  5. Number of bracelet Jessica can make in 180 minutes=12

Jessica can make 12 bracelet in 180 minutes (3 hours).

Step-by-step explanation:

  • Unitary method

Number of bracelet Jessica can make in 30 minutes=2

Number of bracelet Jessica can make in 180 minutes=(180×2)/30=12

or,

  • Arithmetic method

Number of bracelet made by Jessica is directly proportional to the time taken by her.

Number of bracelet made by Jessica=k×time taken by her, where k is a constant

  • 2k=30
  • 4k=60
  • 6k=90
  • 8k=120

In all cases value of k is 15

Therefore,

Let the number of bracelet be x and putting the value of k, we get

xk=180 minutes (3 hours)

15x=180

x=180/15

x=12

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