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? Let's think first. Chain of thought:
John bought 50 - 15 = 35 eBook readers. John has 35 - 3 = 32 eBook readers after losing some. Together they have 50 + 32 = 82 eBook readers.
Therefore, the answer is 82.