How many questions can I answer incorrectly?
Algebra
Level
2
I am given a list with 5 questions. If I answer 1 question in the list incorrectly, 5 more questions would be added to my list. If I want to complete no more than 100 questions, how many questions (maximum) can I answer incorrectly?
100
20
19
18
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1 solution
If I want to do no more than 100 questions wrong, let questions I can answer incorrectly be x . then, number of questions done: 1 0 0 = 5 ( x + 1 ) . Solving for x results in 19. Thus, maximum of 19 questions can be answered incorrectly.