Question 261653
Hello, We can set "x" to represent John's age and 2x for Louise age. Now we can set up an equation to look like this:
x + 2x = 45 Combine like terms to be:
3x=45 Divide both sides by 3 to give us:
x=15
Now we know how old John is and from here I'll let you figure out Louise's age. 
RJ
Check out a new book I wrote at:
www.math-unlock.com