Bone-shaped treats are 5 for $3.50 at Shelley's store and Sarah wants to buy 12. She set up and solved this proportion to find how much they would cost. Describe her error and find the correct solution.

5

3.5

=

12

x

3.5x = 60

x = $17.14

Y = x + 3 x = - 2 [-2, - 15/2] [-2, 5/3] [-2, 11/6] [-2, 13/6]

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