SOLUTION: Write an equation which models how old, in years, a 27 year old will be when she is 3 times as old as a 12 year old person.

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Question 344372: Write an equation which models how old, in years, a 27 year old will be when she is 3 times as old as a 12 year old person.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Write an equation which models how old, in years, a 27 year old will be when she
is 3 times as old as a 12 year old person.
:
let n = number of years ago that this is true
:
27 - n = 3(12 - n)
:
27 - n = 36 - 3n
:
-n + 3n = 36 - 27
:
2n = 9
:
n = 9%2F2
n = 4.5 yrs ago
:
Then he will he will be 27 - 4.5 = 22.5 yrs old
young person will be 12 - 4.5 = 7.5 yrs old
:
3 * 7.5 = 22.5, the age of the older person
: