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Althea signed up for a 30-session Mandarin class. She took 9/10 of it with her friend Pau. She was late for 1/3 of the times that she went to class with Pau. How many sessions did Althea go to class with Pau and was late?
a. 27
b. 3
c. 9
d. 21. (need ko po sa math test)