How Many People Are in This Family?—Only One Detail Changes Everything You Think You See

first glance, you might assume that each of the 9 sons has a different sister, which would make 9 sons + 9 sisters = 18 children. But pay close attention to the wording:

“A man has 9 sons. Each son has a sister.”

Notice it never says that each son has his own separate sister. All 9 sons can share the same sister.

Step-By-Step Solution

1. Count the sons: 9
2. Count continue reading …
   

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