SOLUTION: 5. A boy is 5 years old and his sister is three times as old as he is. When the boy is 15 years old, how old will his sister be?

Algebra ->  Customizable Word Problem Solvers  -> Age -> SOLUTION: 5. A boy is 5 years old and his sister is three times as old as he is. When the boy is 15 years old, how old will his sister be?       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 1118411: 5. A boy is 5 years old and his sister is three times as old as he is. When the boy is 15 years old, how old will his sister be?
Found 2 solutions by josgarithmetic, t0hierry:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
b, boy now
x, sister now
system%28b=5%2Cx=3%2A5=15%29

Boy is 5
and
Sister is 15
NOW.

------------------------------------------------
When the boy is 15 years old, how old will his sister be?
------------------------------------------------

When will that be? Ten more years.

You can answer the question for the exercise.
In ten more years, the sister will be ____________.

Answer by t0hierry(194) About Me  (Show Source):
You can put this solution on YOUR website!
Short answer
b = 5
s = 15
b = 5+10
s = 15 + 10 = 25