SOLUTION: today the age of Pierre is double from jean. In 2 years, they will both be 40 years old. how old is jean?

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Question 1109067: today the age of Pierre is double from jean. In 2 years, they will both be 40 years old. how old is jean?
Answer by ikleyn(52898) About Me  (Show Source):
You can put this solution on YOUR website!
.
P = 2J                  (1)
(P+2) + (J+2) = 40      (2)


Substitute (1) into (2):

(2J+2) + (J+2) = 40

3J + 4 = 40  ====>  3J = 40 - 4 = 36  ====>  J = 36%2F3 = 12.


Answer.  Jean is 12 ears old.

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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
    - 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.