SOLUTION: A dad is 9 times his son's age in 4 years the dad will be 5 times his son's age how old are they now

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Question 1077854: A dad is 9 times his son's age in 4 years the dad will be 5 times his son's age how old are they now
Answer by ikleyn(52808) About Me  (Show Source):
You can put this solution on YOUR website!
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Let S be the son's present age. 

Then the dad's present age is 9S.

In 4 years

9S + 4 = 5*(S+4),   or

9S + 4 = 5S + 20  --->  4S = 20 - 4  --->  4S = 16  --->  S = 16%2F4 = 4.


Answer. The son is 4 years old now. The dad is 4*9 = 36 years old now.

There is a bunch of lessons on age word problems
    - Age problems and their solutions
    - A fresh formulation of a traditional age problem
    - Really intricate age word problem
    - Selected age word problems from the archive
in this site.

Read them and become an expert in solving age problems.

Also, you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Age word problems".