John and Anna bought some eBook readers. John bought 15 eBook readers less than Anna did. Unfortunately, John lost 3 eBook readers. If Anna bought 50 eBook readers, how many eBook readers do they have altogether?
John bought 50-15 = 
<gadget id="calculator">50-15</gadget>
<output>35</output>
35 eBook readers.
John has 35-3 = 
<gadget id="calculator">35-3</gadget>
<output>32</output>
32 eBook readers after losing some.
Together they have 50+32 = 
<gadget id="calculator">50+32</gadget>
<output>82</output>
82 eBook readers.

<result>82</result>