Question 212809
Four years ago, three times Cecile's age was 42, her father's age now. How old is Cecile now?


Step 1.  Let n = current age of Cecile


Step 2.  Let 3(n-4) is three times Cecile's age four years ago


Step 3.  Now 3(n-4)=42   which is Cecile's father's age now


Step 4.  Solve n using the following steps:


{{{3(n-4)=42}}}


{{{3n-12=42}}}


Add 12 to both sides of the equation to isolate 3n


{{{3n-12+12=42+12}}}


{{{3n=54}}}

Divide by 3 to both sides to get n


{{{3n/3=54/3}}}


{{{n=18}}}


Step 5.  Cecile's age is 18 years old.  


Note:  Four years ago she was 14.  3(14)=42 which is her Father's age now.


Hope this was helpful.


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Aood luck in your studies!


Respectfully,
Dr J