SOLUTION: A fir tree is 5 times as old as a pine tree. Seven years from now , the sum of their ages will be 32. How old is the fir tree now?

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Question 51059: A fir tree is 5 times as old as a pine tree. Seven years from now , the sum of their ages will be 32. How old is the fir tree now?
Answer by darq(90) About Me  (Show Source):
You can put this solution on YOUR website!
f=5p
(f+7)+(p+7)=32

substitute f with 5p in the second equation because according to the first equation they are same.

5p+7+p+7=32
6p+14=32
6p=18
pine=3 years old

fir is five times older so it is 3*5=15 years old.