.
In my previous post, I showed you a MENTAL solution without using equation.
In this post, I show an Algebra solution.
Let x be the age of Lee.
Then the age of Sam is (50-x) years.
In 5 years they will be (x+5) years old (Lee) and (50-x+5) = (55-x) years old (Sam).
According to the condition,
4*(x+5) = 55 - x.
Simplify and find x
4x + 20 = 55 - x
4x + x = 55 - 20
5x = 35
x = 35/5 = 7.
ANSWER. Lee is 7 years old now; Sam is 50-7 = 43 years old now,.
Solved.
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There is a bunch of lessons on age word problems
- Age problems and their solutions
- HOW TO algebreze and to solve age problems?
- A fresh formulation of a traditional age problem
- Really intricate age word problems
- Selected age word problems from the archive
- Age problems for mental solution
- Age problem for three participants
- Miscellaneous age problems
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.