Lena, Ira, Rita and Zina — sisters. To them 7, 2, 16 and 13 years (it is unknown, to whom how many). It turned out that the sum of age of Rita and Ira is divided into 44, and Rita and Zina — on 55. How many years to Lena?

288
So, we will consider what there are division options on 4. In our case it is only 7 + 13 = 20. Therefore, Rita can be 7 or 13 years old. Now it is necessary to find number which is divided into 5, proceeding from data. It is 13+2 = 15. Therefore, Rita is 13 years old, Zina is 2 years old, Ira is 7 years old, and Lyonya is 16 years old.
154
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