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Question

Please help to solve this question. 

Can anyone able to show how to draw model drawing? 

 

Thanks 

Answer

 

Boys  Girls 
5 2
-X   
3
+32  

Number of girls is the same, so modify the table to be 

  Boys  Girls
   x 3   15    6
    -X  
   x 2   4            6
    + 32  

Total number of children is increased by 10, which is due to the movement of boys only. So, we can draw the above model for boys. From model, 

11U = 32 – 10

11U = 22

1U  = 2. 

Boys at start = 15U = 15 x 2 = 30. 

Girls at start = 6U   = 6 x 2  = 12 

Total children at start = 30 + 12 = 42

 

Verify

Boys  Girls  Total
30 12  42
-22    
8 12  
+32    
40 12 52

 

52 – 42 = 10. 

 

 

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