Jennifer will be 30 years old in ten years. At that time, her sister Jordana will be three times as old Jennifer. How old is Jennifer's sister now? Let's be accurate as possible.
When Jennifer is 30 years old in ten years, her sister Jordana will be 3 * 30 = 90 years old. She's currently 10 years younger, so she's 90 - 10 = 80 years old.
The answer: 80.