math
posted by danny .
A group of five friends go out to the movies. Their average age is 15. Paco is 13 yrs. old Zoey is 16 yrs. old. What is the average age of the other three friends?

Let x = average (mean) age of three friends. Mean = sum of scores (ages) divided by the number of scores.
(16 + 13 + 3x)/5 = 15
16 + 13 + 3x = 75
3x = 75  29 = 46
x = 15 1/3
I hope this helps. Thanks for asking.
Respond to this Question
Similar Questions

math
i never can do word problems....please help... i got 7 of them.....these are word for word 1) Larry is 8 yrs older than his sister.In 3 yrs, hr will be twice as old as she will be then.how old is each now? 
9th grade math word problems
i never can do word problems....please help... i got 7 of them.....these are word for word 1) Larry is 8 yrs older than his sister.In 3 yrs, hr will be twice as old as she will be then.how old is each now? 
math 7
Nila is now x years old. Three yrs ago, her brother ricky was twice as old as she, write rickys age ten yrs frm now in terms of x. (With solution pls) tnx... 
math 7
Nila is now x years old. Three yrs ago, her brother ricky was twice as old as she, write rickys age ten yrs frm now in terms of x. (With solution pls) tnx... 
English
Make new friends, but keep the old. One is silver, and the other gold. =========================== This is a camp song. About the song, would you answer the following questions? 
Algebra
Let x equal the age, in human years, for a dog that is 2 years old or older. For each of your chosen breeds, write an expression to model its age in dog years. [Hint: Use (x  2) in each expression.] These are the dog years: 2yrs: … 
Algebra
Let x equal the age, in human years, for a dog that is 2 years old or older. For each of your chosen breeds, write an expression to model its age in dog years. [Hint: Use (x2) in each expression.] the dogs are 2yrs: 23 yrs old 3yrs: … 
Math
Let x equal the age, in human years, for a dog that is 2 years old or older. For each of your chosen breeds, write an expression to model its age in dog years. [Hint: Use (x2) in each expression.] the dogs are 2yrs: 23 yrs old 3yrs: … 
Geometry
Let x equal the age, in human years, for a dog that is 2 years old or older. For each of your chosen breeds, write an expression to model its age in dog years. [Hint: Use (x2) in each expression.] the dogs are 2yrs: 23 yrs old 3yrs: … 
Math grade 6, four operations
The sum of mr. brown's age& his sin's age is 38 yrs old this yr.4 yrs ago,mr. Brown was 5 times as old as his son. A. How old is his son this year?