Muhammad's answer to Laraine's Primary 5 Maths Whole Numbers Singapore question.
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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
:)
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