Problema Solution
The average age of the 40 members of a computer science camp is 17 years. Of those attending, 20 are girls, 15 are boys, and 5 are adults. If the average age of the girls is 15 and the average age of the boys is 16, what is the average age of the adults?
Answer provided by our tutors
let a = the average age of the 5 adults
the sum of the ages of the 20 girls is: 20*15 = 300
the sum of the ages of the 15 boys is: 15*16 = 240
the sum of the ages of the 5 adults is: 5a
The average age of the 40 members of a computer science camp is 17 years means:
(300 + 240 + 5a)/40 = 17
by solving we find:
a = 28 years
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the average age of the adults is 28 years.