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 By: drstevewu (offline)  Thursday, August 13 2015 @ 09:53 AM CDT (Read 1060 times)
drstevewu

Can use model method for this question?

Question: 40% of the pupils in a class wore glasses. When 4 pupils who wore glasses left the class, the percentage of the pupils who wore glasses dropped to 25%.How many pupils in the class did not wear glasses?

Thank you..

Junior

Registered: 04/20/10
Posts: 31

 By: echeewh (offline)  Thursday, August 13 2015 @ 04:11 PM CDT
echeewh

Hey <drstevewu>

Following is my worked solution ( by model method )

40% = (2/5) wore glasses (G)

<-G-->
|---|---|---|---|---|

<When 4 pupils who wore glasses left>

25% = (1/4) wore glasses (G)

And the number of pupils who did not wear glasses remains same.

<G>
|---|---|---|---|

Comparing the above 2 models,

1u --> 4

Number of pupils who did not wear glasses
= 3u --> 3 × 4 = 12

======

Trust this helps.

Do let me know again if there is further clarification.

Cheers,
Edward

Active Member

Registered: 04/21/11
Posts: 627

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