A girl has twice as many brothers as sisters. Her brother has the same number of brothers as sisters. How many children are there?
Correct answer: C. 6
- A. 4
- B. 5
- C. 6
- D. 7
Explanation
To solve the problem, let's consider the number of girls as G and boys as B. For the girl: B = 2G. For her brother: B-1 = G. Solving these equations, we find G = 2 and B = 4, meaning there are 6 children in total. With 6 children, the girl has 4 brothers and 1 sister, and each brother has 3 brothers and 2 sisters, satisfying both conditions. Options A, B, and D do not meet both conditions simultaneously.
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Logical problems present several conditions about people, objects, events or choices and require their possible arrangements to be tested. They cover constraint-based reasoning, rankings, matching, grouping, scheduling and elimination, with attention to the difference between a complete solution and a possibility that merely satisfies one condition.
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