Question 1200074: if three times a boy's ages is increased by3, it will equal his sister's age. The sum of their ages now is 23. how old are the boy and his sister?
Let x=boy's age
3x+3=sister's age x+(3x+3)=23
solve for x. solve for 3x+3.
x=________(boys age) 3x+3=_________(sister's age)
verify.
Answer by ikleyn(52776)   (Show Source):
You can put this solution on YOUR website! .
The equation in your post
x + (3x+3) = 23
is correct.
Continue to solve it
x + 3x = 23 - 3
4x = 20
x = 20/4 = 5.
The boy is 5 years old.
The sister is 3*5+3 = 18 years old.
CHECK. 5 + 18 = 23 the sum of their ages. ! correct !
Solved, with explanations.
-----------------
If you want to learn on how to solve simple and simplest linear equations and associated word problems, read the lessons
- HOW TO solve a linear equation
- Simple word problems to solve using a single linear equation
in this site.
Consider these lessons as your textbook, handbook, tutorials and (free of charge) home teacher.
Happy learning (!)
|
|
|
