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Question

On average, there are 2 more boys than girls in each class in Primary 5. There are 12 classes in Primary 5, of which 5 classes have 5 more girls than boys on average. On average, how many more boys than girls are there in the other 7 classes?

Answer

12 x 2 = 24 more boys than girls in the whole level

5 x 5 =25 more girls than guys in that particular 5 classes

25+ 24 = 49

49/7 = 7

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On average, there are 2 more boys than girls in each class in Primary 5. There are 12 classes in Primary 5, of which 5 classes have 5 more girls than boys on average. On average, how many more boys than girls are there in the other 7 classes?

24 more boys than girls (12 * 2)

5*5 + 24 =49 

49/7 = 7

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In total, there are 2 x 12 = 24 more boys than girls for entire P5.

In the 5 classes with more girls, there are 5 x 5 = 25 more girls than boys

There must be 25 other boys to counter these 25 girls.

So in the other 7 classes, there are 25 + 24 = 49 more boys than girls

On average, there are 49 / 7 = 7 more boys than girls in the 7 classes.

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This is Quantity Amount question. 

     5 class   7 class  Total      
Quantity  5 7 12  
Each  -5  7 2  
Product  – 25 49 24  

 

When boy more than girl, we write positive. 

When girl more than bor, we write negative. 

24 – (-25) = 49

49 ÷ 7 = 7

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The answer is 7

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