SOLUTION: Marylin age in 15 years will be three times what it was 13 years ago? How old is Marylyn now

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Question 1064184: Marylin age in 15 years will be three times what it was 13 years ago? How old is Marylyn now
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Let
M = Marilyn's age right now (in years)


Fifteen years from now, Marilyn will be M+15 years old. Thirteen years ago, Marilyn was M-13 years old.


Saying "Marilyn age in 15 years will be three times what it was 13 years ago" translates to this equation
M%2B15+=+3%2A%28M-13%29
Let's solve for M


M%2B15+=+3%2A%28M-13%29


M%2B15+=+3%2AM%2B3%2A%28-13%29


M%2B15+=+3M-39


M%2B15-M+=+3M-39-M


15+=+2M-39


15%2B39+=+2M-39%2B39


54+=+2M


2M=54


2M%2F2=54%2F2


M=27


Marilyn is currently 27 years old