In a class test containing 20 questions, 3 marks are given for every correct answer and (-1) mark is given

for every i

In a class test containing 20 questions, 3 marks are given for every correct answer and (-1) mark is given

for every incorrect answer.

a) John attempts only 9 questions and gets all of them correct. What is his total score?

b) Olivia attempts all questions but gets 11 answers correct. What will be her score?​