Hayes does 3 loads of laundry a week using a detergent pod for each load.  His detergent pods come 39 to a pack.  How many packs of detergent pods will he need to do a full year of laundry?
He uses 3 detergent pods a week and there are 52 weeks in a year, so he uses 3*52 = 
<gadget id="calculator">3*52</gadget>
<output>156</output>
156.
His detergent has 39 pods per pack and he needs 156 pods, so he will need 156/39 = 
<gadget id="calculator">156/39</gadget>
<output>4</output>
4 packs of detergent pods.

<result>4</result>