SOLUTION: If three times a boy’s age is increased by 3, 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 =

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Question 1168453: If three times a boy’s age is increased by 3, 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.

Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!
x, sisters age
b, boys age


You could SUBSTITUTE.
, essentially where you stopped. No reason to stop. KEEP GOING!



-------------Now you find sister's age.
Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!

If three times a boy’s age is increased by 3, 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. 

As requested, x = boy's age

Sister's age: 3x + 3

We then get: x + 3x + 3 = 23 <==== You do have this!!

Can't you solve for x, the boy's age? 

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