Respuesta :
Answer:
Riley got 10 incorrect answers.
Step-by-step explanation:
If she got 10 correct answers she got 50 marks because each correct answer gives +5 marks and 10×5 is 50.
However, in the end Riley got 30 Mark's and the difference between 50 and 30 is 20 so -20 marks is taken from 50.
Furthermore, each incorrect answer gives -2 marks and (-20÷-2 is 10) so Riley got 10 incorrect answers.
Answer: If every 5 marks is one correct answer and she got ten correct then she should've gotten 50 marks but she only got thirty and 2 marks are taken away for every missed question which is a 20 difference so she should have 10 incorrect answers
