In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Example: Article: Homework can put you in a badmood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay.
Answer: whether mood affects their learning ability
Example solution: Researchers did experiments on kids in order to find out _ .
Example explanation: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

Problem: Article: Aged just 25,Gaga has become the icon . Born Stefani Germanotta , Gaga was a child who learnt to play the piano at the age of four .She wrote her first piano ballad at 13 and began performing at open nights a year later .But as a teenager she had a hard time at her strict Catholic school and admitted that she didn't like to obey. She sobbed during a recent HBO documentary: "I still sometimes feel like a loser kid in high school and I just have to pick myself up and tell myself that I'm a superstar every morning so that I can get through this day and be for my fans what they need for me to be. " But aged 17 Gaga managed to escape to New York University's Tisch School of the Arts and by 19 she signed to Def Jam Recordings but quickly dropped after three months .The star went on to write songs for the likes of Britney Spears ,New Kids on the Block , Fergie ,and the Pussycat Dolls but it was Akon who gave her first big break after they worked in pairs as songwriters at Interscope. She released her first album The Fame in 2008 and the rest is pop history--first singleJust Dancetopped the charts and follow-up Poker Face landed her a Grammy award .In 2009,she released The Fame Monster.Gaga was the queen of the Brit Awards in 2010 where she won three prizes .At the MTV Video Music Awards later that year, Gaga won eight prizes in all . Gaga has been busy working on her second album, Born This Way, which is set to be released on May 23.She has already released four singles from the album -the title track,Judas,The Edge of Glory and Hair.
Answer: twenty-five
Solution: Gaga started to give performance at open nights when she was _ .