AC Lim's answer to gxcc1's Primary 5 Maths Whole Numbers Singapore question.
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Average before new (2 class) join= 33
Average after new class join = 32
Different pupils in average = 33-31=1
2 new class with 20 each, total = 40
Decrease in average with this 2 class
= (2 x32) - 40
= 64 - 40
= 24 pupils
Therefore, before 2 new class join in, number of class = 24/1= 24 class
Member of pupils = 24 x 33 = 792 pupils.
Hope this helps
Average after new class join = 32
Different pupils in average = 33-31=1
2 new class with 20 each, total = 40
Decrease in average with this 2 class
= (2 x32) - 40
= 64 - 40
= 24 pupils
Therefore, before 2 new class join in, number of class = 24/1= 24 class
Member of pupils = 24 x 33 = 792 pupils.
Hope this helps
Date Posted:
4 years ago
Typo
1. Different pupils in average = 33-32=1
2. Decrease in average *without* this 2 new class....
1. Different pupils in average = 33-32=1
2. Decrease in average *without* this 2 new class....
Thanks!
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