Question: "How old are you, Robinson?" asked Colonel Crackham one morning.
"Well, I forget exactly," was the reply; "but my brother is two years older than I; my sister is four years older than he; my mother was twenty when I was born; and I was told yesterday that the average age of the four of us is thirty-nine years."
What was Robinson's age?
Answer: Robinson's age must have been 32, his brother's 34, his sister's 38, and his mother's 52.
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