SOLUTION: Danny's father is 4 times as old as Danny. Five years ago, Danny's father was 5 times older. How old is Danny? I have guessed the answer correct but would like to be shown how to

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Question 856776: Danny's father is 4 times as old as Danny. Five years ago, Danny's father was 5 times older. How old is Danny?
I have guessed the answer correct but would like to be shown how to work it out, using the correct method. Thankyou.
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Danny's father is 4 times as old as Danny. Five years ago, Danny's father was 5 times older. How old is Danny?
I have guessed the answer correct but would like to be shown how to work it out, using the correct method.
***
at present:
let x=Danny's age
4x=Father's age
..
5 yrs ago
x-5=Danny's age
4x-5=Father's age
..
4x-5=5(x-5)
4x-5=5x-25
x=20
How old is Danny? 20