Three years ago, the triplets Pavel, Petr, Luke, and their five-year-old sister Jane had been together for 25 years. How old is Jane today?

Correct answer:

j =  13

Step-by-step explanation:

(j-3) + 3(j-3-5) = 25

(j-3) + 3·(j-3-5) = 25

4j = 52

j = 52/4 = 13

j = 13

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