A total of 280 people attended the high school play. The admission prices were $13 for adults, $9 for high school students, and $4 for children not yet in high school. The ticket sales totaled $2160. The principal suggested that next year they raise prices to $18 for adults, $10 for high school students, and $5 for children not yet in high school. He said that if exactly the same number of people attend next year, the ticket sales at the higher prices will total $2680.

How many adults, high school students, and children not yet in high schools attending this year?

Number of adults _______

Number of high school students ________

Number of children not in high school ________