Ned took a test with 20 questions. He lost 5 points for each of the 5 questions he got wrong and earned an additional 10 points for answering a bonus question correctly. How many points did Ned receive or lose overall?
Answer: 5 questions wrong that were each worth 5 points (-5x5=-25) So he lost 25 points but he got 10 extra from the bonus question, so -25 + 10= -15. He lost 15 marks overall
