The Family Mystery

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Four sisters and three brothers.

Super Simple Trick to Solve It:

  1. Let’s assume there are X sisters and Y brothers.
  2. Each girl has (Y) brothers and (X – 1) sisters. → ✅ X – 1 = Y
  3. Each boy has (X) sisters and (Y – 1) brothers → ✅ (Y – 1) = X / 2
  4. Solving gives X = 4, Y = 3
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