Solution #31: How Many Children Were You?

The number of my sisters must be a multiple of 3 and a multiple of 2. It must therefore be a multiple of 6.

Total number of children: [(multiple of 6) x (1 + 1/2)] + 1.

Since this number must be less than 19, the only possible solution for the multiple of 6 is 6 exactly. I therefore have 6 sisters and 3 brothers. We are 10 children in all.

Source: Berrondom, Marie
Categories: Reasoning, Number sense, Multiplication
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