Quote:
Originally Posted by sri340
Ulani has an older sister and a younger sister. Her older sister is one year more than twice Ulani’s age. Ulani’s younger sister is three years younger than she is. The sum of their three ages is 26. Find Ulani’s age.

I think you need to try more problems based on single variable.
I suggest you try problems from
www.mathocean.com which contains lot of word problems based on single variable.