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primary 5 | Maths
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A quiz had 20 questions. Each question carried 5 marks and 1 mark was deducted for every wrong answer. Brandon answered all the questions and scored 70 marks. How many questions did Brandon answer wrongly?
Date Posted: 4 years ago
Views: 261
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done
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clear
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Hope this is clear :)
Date Posted:
4 years ago
I am told to use assumption method
Assume all correct 20x5=100
Difference when when 1 is wrong
19x5-1=94
100-94=6
Difference between assumption and actual
100-70=30
To find out how many wrong answers, take difference between assumption and actual divided by difference in total marks when 1 answer is wrong,
30/6=5
:)
Difference when when 1 is wrong
19x5-1=94
100-94=6
Difference between assumption and actual
100-70=30
To find out how many wrong answers, take difference between assumption and actual divided by difference in total marks when 1 answer is wrong,
30/6=5
:)
Assumption method
———————————
20 questions
Correct answer = 5 marks
Wrong answer = -1 mark
Assumed all answer correctly = 20 x 5 = 100 marks
Shortfall = 100 - 70 = 30 marks
Different between correct and wrong answer = 5 + 1 = 6 marks
Answer wrong question = 30/6 = 5 questions.
Hope this helps.
———————————
20 questions
Correct answer = 5 marks
Wrong answer = -1 mark
Assumed all answer correctly = 20 x 5 = 100 marks
Shortfall = 100 - 70 = 30 marks
Different between correct and wrong answer = 5 + 1 = 6 marks
Answer wrong question = 30/6 = 5 questions.
Hope this helps.
Yes,yes! This is what we are taught in school. Thank you
u shld give this an upvote :)
I gave him an upvote :)
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