SOLUTION: The average age of the 40 members of a computer science camp is 17 years. There are 20 girls, 15 boys, and 5 adults. If the average age of the girls is 15 and the average age of th

Question 284719: The average age of the 40 members of a computer science camp is 17 years. There are 20 girls, 15 boys, and 5 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?
(A) 26 (B) 27 (C) 28 (D) 29 (E) 30
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
20 girls avg age =15
15 boys avg age =16
Total 40 avg age = 17
Let the average age of adults be x. 5 adults
Total age of all students / total students = 17
5x+15*16+20*15 / 40 = 17
5x+240+300=40*17
5x+540=680
5x=680-540
5x=140
x= 140/5
x= 28
The average age of adults = 28

RELATED QUESTIONS
there were 15 girls and 25 boys in a science club. what percent of the members are girls? (answered by jim_thompson5910,Edwin McCravy)

the computer club has 37 members. there are 5 more girls than boys. how many girls and... (answered by algebriac)

there are 15 girls in a class.if 5/6 of the members are girls,how many members are... (answered by stanbon)

There are 485 soccer player at a camp. Find the ratio of girls to boys if there are 283... (answered by stanbon)

there are 30 boys and 60 girls in a class. if the average age of boys is 12 year and... (answered by TimothyLamb)

The average age of all the students of a class is 18.0 years. The average age of boys of... (answered by Fombitz)

What is the ratio of boys to girls if there are 20 boys and 10... (answered by Cromlix)

There are 15 girls in the fifth-grade chorus. If 5/6 of the members are girls, how many... (answered by ikleyn)

The average age of the boys in a school is 14 years 6 months and average age of the girls (answered by ankor@dixie-net.com)