.
NOW : Thando now is x years old;
Her dad is 3x years old.
TEN YEARS AGO
7*(x-10) = 3x-10.
Simplify and solve
7x - 70 = 3x - 10
7x - 3x = 70 - 10
4x = 60
x = 60/4 = 15.
ANSWER. Thando is 15 years old; her dad is 3*15 = 45 years old.
Solved.
Check it on your own that the answer is correct.
-----------------
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 problems
- Selected age word problems from the archive
- Age problems for mental solution
- 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.