Question 1064184
<font color=black size=3>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+15 = 3*(M-13)}}}
Let's solve for M



{{{M+15 = 3*(M-13)}}}



{{{M+15 = 3*M+3*(-13)}}}



{{{M+15 = 3M-39}}}



{{{M+15-M = 3M-39-M}}}



{{{15 = 2M-39}}}



{{{15+39 = 2M-39+39}}}



{{{54 = 2M}}}



{{{2M=54}}}



{{{2M/2=54/2}}}



{{{M=27}}}



Marilyn is currently <font color=red>27 years old</font></font>