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"The three sisters" question asked:

Jenny is one of three sisters. Her age is 1/3rd the sum of the ages of all three sisters. The ages of her two sisters, Jody and Jan,
total 36. Jody is 4 years younger than Jan. They are not triplets and there are no twins. What is the age of each sister?

The answer is:

Jody is 16.  Jenny is 18.  Jan is 20.
Jenny's age is 1/3rd the total of the three sister's ages. The total of her other two sister's ages is 36, which makes up the remaining 2/3rds of the total. Therefore Jenny is 18. Jody is 4 years younger than Jan and as their two ages alone total 36 then  Jody can only be 16 and Jan 20.

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