The average of a group of 10 students is 15 years. When 5 more students joined the group, the average age rose by 1 year. What is the average age of the newly joined students?

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Salam used part of Tk. 100,000 to purchase a television. Of the remaining portion, he invested 1/3 of it at 4 percent simple annual interest and 2/3 it at 6 percent simple annual interest, if after a year the income from the two investments totaled Tk 320, what was the purchase price of the television?

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