J's answer to Janice's Primary 5 Maths Whole Numbers Singapore question.
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Concept tested : average, excess-shortage
Question type : Double 'if'
Difference between 20 more marks and 4 more marks is :
20 - 4 = 16
With 16 more marks, the average goes up by : 80 - 78 = 2
Since the average increases by 2, every student got 2 marks more if we considered the total number of marks to be divided equally among them.
Number of students including Jacob = 16 ÷ 2 = 8
Question type : Double 'if'
Difference between 20 more marks and 4 more marks is :
20 - 4 = 16
With 16 more marks, the average goes up by : 80 - 78 = 2
Since the average increases by 2, every student got 2 marks more if we considered the total number of marks to be divided equally among them.
Number of students including Jacob = 16 ÷ 2 = 8
Date Posted:
2 years ago
It is correct.
Thank you so much!
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