SOLUTION: Seven years ago, Martin’s age was one third of the age he will be in 9 years. How old is he now?

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Question 1114246: Seven years ago, Martin’s age was one third of the age he will be in 9 years. How old is he now?
Answer by ikleyn(52787)   (Show Source): You can put this solution on YOUR website!
.
The problem says that


M - 7 = ,


where M is the Martin's age today.


Simplify and solve for M


3M - 21 = M + 9

3M - M = 9 + 21

2M = 30  ====>  M =  = 15.


Answer.  Martin is 15 years now.

Solved.

Check the solution on your own.

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On age word problems,  see the lessons
    - 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
    - Age problems for mental solution
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".


Save the link to this online textbook together with its description

Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson

to your archive and use it when it is needed.



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