By including extra information testers can&#x27;t just be coached or memorize apply this formula when you see this kind of question and the test shows they&#x27;re actually understanding more real world problems and how to take what they know and how to apply it to a problem where everything hasn&#x27;t been stripped away for you. If students are tricked by the simple extraneous information it shows there&#x27;s a gap in their ability to take information and use math to answer a question about it. That&#x27;s an important thing to evaluate.