Question

Which unit rate is the lowest price per ounce?

Answer 1

Answer is Choice A

1.49 / 6 = 0.25

3.59/13 = 0.28

Answer 2

The first thing to do is find the unit rate for both

Choice A: 6 oz for 1.49
To get 6 to 1 you have to divide by 6. What you do to one side you must do to the other... So:
1.49/6=0.2483333
Round to the nearest tenth. 0.25
Choice A unit price is 0.25

Choice B: 13 oz for 3.59
To get 13 to 1 you need to divide by 13. What you do to one side you must do to the other... So:
3.59/13=0.2761
Round to the nearest tenth. 0.28

Then compare the two. 
Answer: Choice B is a higher unit price. 

Hope this helps!