You can put this solution on YOUR website! x=number of years until Sarah is half as old as her mother.
35+x=2(11+x)
35+x=22+2x
13 years=x ANSWER: In 13 years, Sarah will be half as old as her mother.
CHECK:
35 years+13 years=2(11 years+13 years)
48 years=2(24 years)
48 years=48 years