The doctor told Barry to take vitamin D3 for 180 days to help protect him from infections. The pharmacy only sold vitamin D3 in bottles containing 60 capsules, with a daily serving size of 2 capsules.  How many bottles would Barry need to buy to have enough servings to last for 180 days?
If each serving size is 2 capsules, a 60-capsule bottle of vitamin D3 would contain 60/2=
<gadget id="calculator">60/2</gadget>
<output>30</output>
30 servings.
Using 30-serving bottles, to last 180 days, it would take 180/30=
<gadget id="calculator">180/30</gadget>
<output>6</output>
6 bottles of vitamin D3.

<result>6</result>